How To Clean A Sauna And Do Basic Care & Maintenance Right

Have you been Googling how to clean a sauna and getting hit with advice that is either way too complicated or totally vague? The truth is, while cleaning a sauna isn’t hard, it does take a bit of know-how, especially with wood surfaces, heat, and moisture all in the mix. 

In this guide, we will break everything down. We will show exactly how to clean a sauna and take care of it the right way, so it stays fresh, safe, and ready whenever you are.

How To Clean A Sauna: A Quick Overview

Understand Your Sauna: Comparing Different Sauna Types & Wood Materials

Saunas are primarily made of wood because of its excellent insulation properties and natural aesthetics. Different sauna types have varying cleaning requirements based on their design and operation:

• Finnish (Dry) saunas: Operating at 80-100°C with low humidity (below 20%), these traditional saunas need regular wood maintenance to prevent sweat absorption.
• Steam baths/Turkish baths: With temperatures around 70°C and nearly 100% humidity, these require extra attention to prevent mold growth.
• Infrared saunas: Though operating at lower temperatures, they still need regular cleaning as body oils and sweat can accumulate on surfaces.

The wood type in your sauna also matters. Nordic white spruce, western red cedar, and Canadian hemlock are common choices, each with specific care needs. Cedar naturally resists bacteria but can darken over time, while hemlock and spruce may require more frequent cleaning to maintain their appearance.

How To Clean A Sauna: Step-by-Step Guide for Every Sauna Type

Let’s walk through exactly how to clean your sauna from start to finish:

1. Preparation

• Turn off your sauna and allow it to cool completely
• Open doors and windows for ventilation
• Gather all cleaning supplies before starting

2. Surface Cleaning

• Start from the top and work downward
• Vacuum or sweep loose debris from benches, walls, and the floor
• Pay special attention to corners where dirt accumulates

3. Wood Treatment

• Mix your chosen cleaning solution (mild soap or vinegar solution)
• Dampen—don't soak—a soft cloth or brush with the solution
• Scrub wooden surfaces in the direction of the grain
• For benches, focus on areas where bodies contact the wood
• Use a clean, damp cloth to wipe away cleaner residue

4. Disinfection

• For natural disinfection, use a 1:1 vinegar and water spray
• Apply to all surfaces and let sit for 5-10 minutes
• Wipe down with a clean, damp cloth
• For stubborn stains, make a paste with baking soda and water
• Apply paste to stains, let sit briefly, then gently scrub

5. Odor Management

• After cleaning, a final wipe with lemon-infused water will leave a fresh scent
• For persistent odors, place a small bowl of baking soda in the sauna overnight
• Consider natural scents like eucalyptus or birch for authentic sauna aromatherapy

6. Drying & Ventilation

• Thoroughly dry all surfaces with clean towels
• Leave the door open for at least several hours (preferably overnight)
• Ensure ventilation systems are clear and functioning

How To Keep Your Outdoor Sauna Safe In Any Season?

Here’s how to protect and maintain your outdoor sauna so it stays in great shape no matter the season:

Start with Shelter: Protect Your Sauna from the Elements

Direct exposure to rain, snow, and harsh sun can shorten your sauna’s lifespan and damage electrical components.

What to do:

• Install your sauna under a roof extension, in a gazebo, or use a custom weatherproof cover.
• Make sure the base is raised (concrete slab, deck, or patio stones) to avoid water pooling.
• Avoid setting it directly on soil or grass.

Weatherproof the Electrical System

Outdoor infrared saunas require power, and moisture exposure can lead to shorts or long-term electrical failure.

What to do:

• Use outdoor-rated, GFCI-protected outlets.
• Routinely inspect all cables, connections, and seals for signs of wear or cracks.
• Keep all junction boxes covered and out of rain or snow contact.

Keep the Exterior Clean and Treated

Exterior wood faces more wear than indoor models due to UV rays and moisture.

What to do:

• Clean the outside walls monthly using a mild soap and water solution—never pressure wash.
• Reapply a UV-resistant, water-repellent wood oil (sauna-safe and non-toxic) every 6–12 months.
• Check for signs of mold or mildew under the eaves and around seams.

Winter Care: What to Do When It Snows

Snow buildup can cause wood swelling, affect seals, and stress the roof structure.

What to do:

• Brush off snow from the roof after heavy storms using a soft broom.
• Keep the entrance clear of snow to avoid water tracking inside.
• Allow longer warm-up times during cold snaps and check that ventilation isn’t blocked by ice.

Rainy Season Tips: Stop Moisture Before It Starts

Persistent dampness can cause mold growth, corrosion, and warped panels.

What to do:

• Add weather stripping around the door to reduce water ingress.
• Install a drip edge or overhang if none exists.
• After rain, crack the door open and run the sauna briefly to dry internal moisture.

Seasonal Inspections Matter

Outdoor saunas deal with changing temperatures and conditions all year long.

What to do each season:

• Inspect the roof for leaks or soft spots.
• Look for signs of wood discoloration, mildew, or insect damage.
• Check performance. If heat feels uneven, clean behind emitter guards and contact support if needed.

How To Clean An Infrared Sauna? Tips Every Owner Should Know

Make sure your infrared sauna stays fresh and safe by following these simple cleaning steps:

1. Unplug First: Always Start With Safety

Infrared saunas rely on electric panels that should never be cleaned while powered on. Turn off and unplug your sauna before cleaning. Let it cool completely, as this protects both you and the equipment.

2. Use A Damp Cloth To Clean Daily

Infrared saunas don’t create steam, so sweat stays on the surface. Use a damp microfiber cloth to wipe benches, backrests, walls, and the floor. Always go with the wood grain to prevent splinters. Avoid soaking the cloth because light moisture is enough to lift sweat and body oil.

3. Go Natural With Your Cleaners

High heat can cause harsh chemicals to off-gas, making natural products the safest choice. Try this infrared-safe routine:

• General cleaner: 1 cup warm water + 1 cup white vinegar (spray and wipe)
• Stain remover: 3 tbsp baking soda + 1 tbsp water (apply, sit 10 min, wipe)
• Deodorizer: Juice of 1 lemon + 1 cup warm water (light spray, air dry)

4. Don’t Forget the Floor & Corners

Infrared saunas have wooden floors that trap dust and debris if ignored. Use a soft brush or small vacuum weekly to sweep around floorboards and under benches. Clean behind the infrared panels if accessible because dust buildup can reduce performance.

5. Fresh Air Is Part of Cleaning

Even in dry saunas, trapped moisture from sweat needs time to evaporate. After cleaning, leave the sauna door open for at least 4–6 hours. If your unit has a fan or ventilation feature, use it to improve airflow.

6. Skip the Oils & Coatings

Oils and wood treatments may smell great, but they can release toxic vapors when heated. Avoid:

• Oil-based wood sealants
• Furniture polishes
• Any coating not marked sauna-safe

Instead, allow the wood to breathe and clean it regularly to maintain its natural finish.

How Often Do You Need To Clean Your Sauna: A Simple Maintenance Timeline

Frequency matters when it comes to sauna care, so here’s a general schedule to help you keep things clean:

• After each use: Always wipe down benches and backrests to remove sweat and leave the door open to dry.
• Weekly cleaning: For saunas used 3-5 times weekly, perform a thorough cleaning including benches, walls, and floors.
• Monthly deep cleaning: Even with regular maintenance, a deep clean once a month helps prevent buildup and extend your sauna's life.
• Seasonal maintenance: Check equipment, stones, and wood integrity each season, with more comprehensive assessments before heavy-use periods.

Commercial saunas require more frequent cleaning because of higher usage rates and public health considerations.

Essential Sauna Cleaning Tools & Products: A Quick Checklist For Easy Maintenance

Using the right tools makes cleaning more effective while protecting your sauna's surfaces:

Recommended Tools For Sauna Cleaning

• Soft-bristled brush or hand brush
• Microfiber cloths
• Small vacuum with soft attachments
• Fine sandpaper (150-180 grit)
• Bucket for cleaning solutions

Effective Sauna Cleaning Solutions

Natural Options:

• White vinegar and warm water (General cleaner)
  
  • Mix: 1 cup white vinegar + 1 cup warm water
  • Use for: Wiping down benches, walls, door handles, and headrests.
  • Instructions: Mix in a spray bottle. Spray directly on surfaces and wipe with a clean, damp cloth. For larger saunas, double the recipe.
    
• Baking Soda Paste (Stubborn Stains and Sweat Marks)
  • Mix: 3 tablespoons baking soda + 1 tablespoon water (add more for desired consistency)
  • Use for: Tough spots on wood where sweat, oil, or mildew may have built up.
  • Instructions: Apply paste with a cloth or soft brush. Let it sit for 10–15 minutes, then wipe clean with a damp cloth. Repeat as needed for persistent stains.
• Lemon Juice (Disinfecting and Fresh Scent)
  
  • Mix: Juice from 1 whole lemon + 1 cup warm water
  • Use for: A natural disinfectant and deodorizer—ideal after vinegar cleaning.
  • Instructions: Mix in a spray bottle. Spray lightly on benches and let air dry.
  • Optional: Add lemon zest for a stronger aroma.

Commercial Products:

• Wood-specific mild soap (pH-neutral)
• Specialized sauna cleaners (free of harsh chemicals)

What to Avoid

• Bleach ammonia-based cleaners: These release toxic fumes when heated, which can linger in the wood and harm users during sauna sessions.
• Pressure washers or garden hoses: These can force water deep into the wood, causing warping, mold growth, and long-term damage.
• Abrasive scrubbers: They scratch and wear down the soft wood surfaces, making them more prone to staining and splintering.
• Oil-based wood preservatives: These can emit harmful vapors when the sauna heats up, creating unsafe air quality for users.

Sauna Wood Maintenance: How To Protect & Preserve Your Sauna’s Interior 

To keep your sauna safe and long-lasting, follow these wood-specific cleaning tips:

Preventing & Treating Stains

• Always use towels on benches during sauna sessions
• For sweat stains, gentle scrubbing with a soft brush and mild soap usually suffices
• Apply baking soda paste to stubborn stains, let sit for 15 minutes, then scrub gently

Deep Cleaning With Sanding

• For persistent discoloration or rough areas, light sanding can refresh the wood
• Use only fine-grit sandpaper (150-180)
• Sand gently in the direction of the grain
• Vacuum all dust thoroughly after sanding
• Wipe down with a damp cloth

Remember: Never use varnish, paint, or stain on interior sauna surfaces. These finishes can release toxic fumes when heated and prevent the wood from breathing properly.

Maintaining Sauna Equipment: What to Check, Clean, & Replace Regularly

A well-maintained sauna equipment keeps your sauna running smoothly—here’s how to handle it:

Sauna Stones

• Remove and rinse stones every 2-3 months
• Discard any that are cracked or discolored
• Replace all stones every 1-2 years, depending on use
• When replacing, arrange to allow proper airflow

Heater Maintenance

• Keep the area around heating elements free of debris
• For wood-burning stoves, remove ash regularly
• For electric heaters, ensure contacts are clean and secure
• Follow the manufacturer's guidelines for specific maintenance

Hardware Care

• Check door hinges and handles monthly
• Apply food-grade mineral oil to wooden door handles if they become dry
• Tighten any loose screws or fittings
• Clean glass doors with a vinegar solution for streak-free results

Preventative Measures For Sauna Care: Easy Habits That Protect Your Investment

A few simple habits can go a long way in keeping your sauna clean from the start:

Before Entering

• Shower with soap to remove oils, dirt, and cosmetic products
• Never use lotions, oils, or perfumes before sauna use
• Remove jewelry that could heat up or scratch wood surfaces

During Use

• Always sit on a towel large enough to catch dripping sweat
• Use clean, dedicated sauna footwear or go barefoot (if hygienic)
• Avoid bringing food or drinks (except water) into the sauna

After Sessions

• Wipe down benches with a clean, damp cloth
• Leave the door open to release humidity
• Turn on ventilation systems if available

Troubleshooting Common Sauna Problems: Easy Solutions You Can Try At Home

From odd smells to heating issues, here’s how to handle the most common sauna troubles:

Mold & Mildew

If you spot mold or mildew:

• Mix equal parts white vinegar and water
• Spray affected areas generously
• Let it sit for 1 hour
• Scrub with a soft brush
• Rinse with clean water
• Keep the sauna dry and well-ventilated for 48 hours
• For severe cases, consult a professional

Persistent Odors

• Check for hidden moisture or mold in corners and under benches
• Clean ventilation systems and filters
• Place activated charcoal in the sauna when not in use to absorb odors
• Consider an ozone treatment for commercial saunas (professional service)

Wood Damage

• Small cracks in wood are normal due to heat cycles
• For splinters, sand carefully with fine-grit paper
• Replace severely damaged bench slats
• Never try to fill cracks with putty or wood filler, as these can release chemicals when heated

7 Sauna Slip-Ups That Can Ruin Your Relaxation Spot

Here are some common habits that may be making your sauna harder to keep clean without you even realizing it:

1. Not Using A Towel To Sit Or Lean On

Sweat seeps into the wood, leaving behind stains and odors that are hard to remove.

What to do instead:

• Sit and lean on clean cotton or linen towels every time.
• Change towels after each session to avoid bacterial buildup.

2. Entering Without Showering First

Body oils, lotions, deodorants, and dirt transfer to the benches and walls, which can cause sticky buildup, unpleasant odors, and long-term staining on the wood.

What to do instead:

• Take a full soap shower before using the sauna.
• Avoid applying products to your skin beforehand.

3. Leaving Wet Towels Or Clothes Inside

Damp fabrics hold moisture and invite mildew, which spreads to the wood.

What to do instead:

• Remove all damp items immediately after your session.
• Hang towels to dry in a well-ventilated area.

4. Not Cleaning After Each Use

Sweat and residue accumulate quickly and cause odors, stains, and bacterial buildup.

What to do instead:

• Wipe down benches, backrests, and handles with a damp cloth after every session.
• Keep a dedicated microfiber cloth nearby for easy access.

5. Wearing Shoes Or Bringing In Outdoor Items

Dirt, bacteria, and debris from shoes or gym bags can settle into floorboards and corners.

What to do instead:

• Always enter barefoot or with clean sauna-only slippers.
• Leave bags, shoes, and gear outside.

6. Using the Same Cleaning Cloth Too Long

Old or dirty clothes can carry leftover sweat, oils, and bacteria from previous cleanings, which end up getting wiped back onto the wood.

What to do instead:

• Rinse or replace cleaning clothes frequently.
• Wash them after each week of use with hot water.

7. Letting The Sauna Stay Closed After Use

Trapped heat and moisture promote bacterial growth and mildew inside.

What to do instead:

• Leave the sauna door open for several hours to allow airflow.
• Use a fan or a window nearby to improve drying.

When Cleaning Isn’t Enough: Signs Your Sauna Needs Professional Service

If basic cleaning isn’t enough, these signs may indicate it’s time to call in a professional for proper inspection and repair:

1. Persistent Mold That Keeps Coming Back

If you’ve scrubbed, dried, and ventilated but mold still returns, there may be hidden moisture or insulation issues.

Professional solution: A licensed technician can perform moisture detection, deep sanitation, and re-sealing.

2. Electrical Issues Or Panel Malfunctions

Flickering lights, uneven heating, or tripped breakers are signs of internal electrical problems and should not be handled as a DIY project.

Professional solution: Certified electricians familiar with sauna systems should inspect and repair all wiring.

3. Unusual Odors That Won’t Go Away

If your sauna smells burnt, metallic, or musty even after cleaning, it may point to deeper issues like mildew in wall cavities or overheating components.

Professional solution: A specialist can safely remove paneling to inspect what's hidden behind.

4. Warped or Cracked Walls & Benches

Minor surface splits are normal, but if entire boards swell, curve, or split, your sauna’s structure could be compromised.

Professional solution: Sauna carpenters or installers can replace or reinforce panels using wood types that match your model.

5. Inconsistent Temperature Or Heat Loss

If your sauna isn’t retaining heat or takes unusually long to warm up, the issue may be with the infrared emitters, insulation, or seals.

Professional solution: Technicians can test emitter output and restore energy efficiency with proper recalibration or replacements.

6. Excessive Condensation Inside An Infrared Sauna

Infrared saunas are dry heat systems, so visible condensation is a red flag, especially on glass or ceiling panels.

Professional solution: Inspection of ventilation, roof integrity, and placement is needed to fix the moisture imbalance.

7. Unexplained Discoloration Or Staining

Dark patches that grow over time may be more than sweat stains and can indicate issues like fungus, resin bleed, or rotting wood underneath the surface.

Professional solution: A sauna expert can sand, refinish, or swap panels while keeping the structure safe and toxin-free.

Conclusion

Consistent cleaning is your key to a fresh, safe, and long-lasting sauna. By following these tips on how to clean a sauna, you protect your investment and create a healthier space to relax. Simple habits like using towels, showering first, and wiping surfaces make a big difference.

Looking for a premium sauna that won’t warp, crack, or underperform in harsh weather? At Nordvik, we build panorama saunas, barrel saunas, and cube saunas using kiln-dried Canadian cedar and designs tested to last through snow, rain, and daily use.

Join over thousands of sauna owners who trust Nordvik for a blend of clean design, comfort, and real-world durability—because a good sauna should feel amazing and last for years.

FAQs

How do you protect a sauna?

To protect your sauna, wipe it down after each use, let it air dry, and avoid bringing in shoes or harsh chemicals. Using a towel to sit on also helps prevent sweat stains and moisture damage.

What is the best sauna cleaner?

The best sauna cleaner is a mild, natural solution, like a mix of warm water and white vinegar. It cleans effectively without damaging the wood or leaving behind harmful fumes.

What do you spray in a sauna?

You can spray a gentle mix of water and essential oils like eucalyptus or lavender for a fresh scent. For cleaning, use a water-vinegar solution to wipe down benches and walls safely.

How to make a sauna cleaner?

Mix equal parts warm water and white vinegar in a spray bottle. This simple, non-toxic solution gently disinfects and deodorizes without harming your sauna’s wood.