How to Clean an Infrared Sauna - Safe Cleaning Guide

This guide walks you through exactly how to clean an infrared sauna, covering daily wipe-downs, weekly routines, and monthly deep cleans. Follow these steps and your sauna will stay bacteria-free, odor-free, and structurally sound for 10-20 years. Skip them, and you are looking at $500-$2,000 in avoidable repairs to heaters and wood.

Before You Start

Time required: 5-10 minutes daily, 20-30 minutes weekly, 45-60 minutes monthly

Tools and supplies you need:

• ●Microfiber cloths, at least 4-6 (non-linting, $5-$10 per pack)
• ●Apple cider vinegar or white distilled vinegar ($5 per bottle)
• ●Hydrogen peroxide ($3 per bottle)
• ●A spray bottle ($2-$5)
• ●150-grit sanding sponge for deep cleans ($5-$15)
• ●Hand vacuum with attachment
• ●Rubbing alcohol (70% isopropyl)
• ●Towels or washable bench pads ($20-$50, Clearlight or Sunlighten brands recommended)
• ●Optional - Sunlighten Natural Cleaning Kit ($40-$60) for warranty-safe commercial cleaning

Prerequisites: Always let the sauna cool completely before cleaning heaters or control panels. Never clean electrical components while the unit is powered on or still warm from a session.

Step 1 - Place Towels Before Every Single Session

Before you sit down, lay a towel or washable bench pad across every surface you will contact: the bench seat, the backrest, and the floor area around your feet.

This single habit eliminates roughly 90% of cleaning labor over the life of your sauna. Sweat absorbed by a towel stays in the towel and goes straight to your laundry. Sweat absorbed by raw cedar or hemlock wood embeds into the grain, requires sanding to remove, and causes the oils and bacteria buildup that leads to odors and discoloration.

Clearlight and Sunlighten both specifically recommend bench pads for their units, and for good reason. Owners who use them consistently report their saunas need deep cleaning half as often compared to bare-wood users.

Clearlight-brand pads and Sunlighten pads run $20-$50 each. Any thick, washable cotton towel works equally well. Wash bench pads and towels after every 2-3 sessions in hot water with unscented detergent.

This is not optional maintenance - it is the foundation everything else builds on.

Step 2 - Wipe Down All Surfaces After Each Session

Within 30 minutes of finishing a session, take a damp microfiber cloth and wipe every interior surface: benches, walls, door handles, and the floor.

The sauna is still warm at this point, which actually helps. Sweat and skin oils have not fully dried or bonded to the wood, so they wipe away easily. Use plain warm water on the cloth - no soap, no cleaner. Wring it out thoroughly so it is damp, not wet. You want to lift residue, not saturate the wood.

Pay extra attention to high-touch areas: door handles, bench edges where hands grip, and the lower bench slats near floor level. Lower slats trap moisture longest and are the first place mold appears when maintenance gets skipped.

After wiping, leave the sauna door open for 15-20 minutes to air dry. If your unit has a ventilation setting, run it at low heat for 20-30 minutes. Trapped moisture in a sealed unit - even from just damp-wiping - is the primary cause of mold growth on lower wood panels.

This wipe-down takes 5-7 minutes and prevents the buildup that requires 45 minutes of scrubbing to fix later.

Step 3 - Vacuum Floors and Dust Heaters Weekly

Once per week, run a hand vacuum with a brush attachment across the entire floor of the sauna. In 2-4 person models ($2,000-$6,000), which see more foot traffic, debris accumulates fast: hair, dead skin cells, dirt tracked in from bare feet. Standard vacuuming takes 3-4 minutes and prevents debris from grinding into the wood grain.

While you have the vacuum out, address the infrared heaters. This is a critical step that most owners skip.

Dust accumulates on heater guards and ceramic plates over time. When the sauna heats up, that dust burns and releases odors into the air you are breathing. Use a dry microfiber cloth or a lint roller on the heater guards. For crevices in the guard mesh, a short burst of compressed air works well.

Warning: Never use wet wipes, damp cloths, or any liquid on the heaters. Moisture on infrared heater components voids warranties on Sunstream and Clearlight units and risks electrical shorts. Heater replacement runs $100-$300 per unit. Always confirm the sauna is fully cooled and unplugged before touching the heaters.

Dusting heaters takes 5 minutes and directly protects the most expensive components in your sauna.

Step 4 - Clean Glass Doors and Control Panels Weekly

Glass doors and control panels need their own attention separate from the wood surfaces. They pick up fingerprints, oils, and bacteria differently than porous wood does.

For glass doors and any glass panels: mix a 1:1 solution of white vinegar and water in a spray bottle. Spray lightly onto a microfiber cloth - not directly onto the glass - and wipe in straight horizontal passes. This leaves zero streaks and requires no rinsing. Non-ammonia commercial glass cleaners also work fine. Never use ammonia-based glass cleaners like standard Windex inside a sauna. At 120-140°F, ammonia fumes off rapidly and the smell is both unpleasant and potentially harmful.

For the digital control panel: dampen a microfiber cloth with 70% isopropyl rubbing alcohol. Wipe the panel, buttons, and any display screen gently. Alcohol kills bacteria on contact and evaporates without residue. Do not spray anything directly at the control panel - liquid seeping into the electronics causes the type of damage that runs $200-$500 to fix.

Both tasks combined take under 10 minutes per week.

Step 5 - Deep Clean Wood Surfaces Monthly

Once per month, the wood interior needs a proper deep clean to remove embedded oils, light staining, and any bacteria that regular damp wiping missed.

Mix your cleaning solution using one of these proven ratios:

• ●Standard deep clean: 3 parts warm water to 1 part apple cider vinegar
• ●Heavy odor or staining: Equal parts white vinegar and water
• ●Sanitizing focus: 2 tablespoons hydrogen peroxide in a full spray bottle of water

Spray lightly onto the bench surface - the wood should look barely damp, not wet. Let the solution sit for 60-90 seconds. Then scrub in circular motions using a 150-grit sanding sponge on stained or discolored areas, or a soft microfiber cloth on clean areas. The 150-grit sponge removes 95% of embedded oils from cedar and aspen without damaging the wood grain.

After scrubbing, wipe the surface with a clean damp cloth to remove the solution. Then immediately dry with a dry cloth. Never leave wood wet.

If you prefer a commercial option, the Sunlighten Natural Cleaning Kit ($40-$60) is specifically formulated for sauna wood and glass, is warranty-safe on all Sunlighten models, and outperforms vinegar on glass surfaces in streak tests.

After cleaning, inspect all wood surfaces for cracks, soft spots, or gray discoloration. Any softening of hemlock or eucalyptus panels indicates moisture damage - address it with a sanding and $50-$100 wood sealant kit before it spreads.

Step 6 - Deodorize and Ventilate After Deep Cleans

After the monthly deep clean, the sauna needs full ventilation before your next session.

Leave the door fully open for at least 30 minutes after any cleaning involving vinegar or hydrogen peroxide. Vinegar smell dissipates quickly in open air but can linger in a sealed unit for hours. Running the sauna at a low temperature setting for 20-30 minutes with the door cracked accelerates this process.

For persistent odors in 4-person units or saunas used heavily over 50+ sessions, vinegar is particularly effective. Wipe all interior surfaces - including the ceiling - with the vinegar-water solution and run the ventilation cycle. Reddit sauna communities consistently cite this as the most effective odor reset for older units.

If your sauna has a built-in ventilation fan, use it after every cleaning session. Aftermarket ventilation fans run $50 and are worth adding to any unit without one.

Premium models like the Sunlighten mPulse ($5,000-$8,000) include HEPA filters that trap 99.97% of airborne particles, which substantially reduces how much settles on surfaces between cleans.

Common Mistakes to Avoid

Skipping towels on bare wood. Sweating directly onto cedar or hemlock without a towel causes 80% of all cleaning problems in infrared saunas. Embedded body oils require sanding to remove - a job that takes 2x longer than everything else on this list combined.

Using bleach or ammonia-based cleaners. These penetrate porous wood and off-gas toxic fumes at sauna temperatures of 120-140°F. They also void 5-7 year warranties from Clearlight and Sunlighten. Stick to vinegar, hydrogen peroxide, or purpose-made sauna cleaners.

Cleaning heaters while warm or wet-wiping them. Moisture on heater components causes electrical shorts and burns. Always confirm the unit is cool and unplugged first.

Assuming infrared saunas need steam cleaning. They do not. The dry heat environment evaporates moisture fast. Steam cleaning introduces far more water than the wood can handle and invites warping.

Using soap on wood surfaces. Soap builds up a residue layer that traps bacteria instead of removing it. pH-neutral solutions like diluted vinegar clean without leaving anything behind.

Not drying thoroughly after cleaning. Any cleaning that leaves wood damp, even slightly, creates conditions for mold on lower slats. Always follow every clean with a dry cloth pass and a ventilation cycle.

Next Steps

Start with Step 1 at your very next session - get towels or bench pads in place before anything else. That single change delivers more impact than any cleaning product you can buy.

Set a weekly phone reminder for the glass, vacuum, and heater dusting routine. It takes 15 minutes total and keeps your sauna fresh between deep cleans.

Mark your calendar for a monthly deep clean on a set date. After three months of consistent cleaning, you will notice the monthly session takes half the time because daily and weekly steps are doing the heavy lifting.

If your sauna is new, review your specific warranty documentation from Clearlight, Sunlighten, Dynamic, or whichever brand you own. Some warranties specify approved cleaning products - using an off-list cleaner can void coverage on a $3,000-$8,000 investment. When in doubt, diluted white vinegar and microfiber cloths are safe for every brand on the market.