Home saunas — both infrared and traditional wood-fired or electric — absorb significant sweat and moisture with each use. The untreated wood interior absorbs oils and bacteria from sweat, which causes the characteristic sour odour in neglected saunas. Regular cleaning after each use and a deeper monthly clean keeps the wood hygienic and extends its life.
After Every Use
- Wipe down the benches and backrests with a clean dry towel or a barely damp cloth immediately after use — removing sweat before it soaks into the wood is the most important step
- Leave the sauna door open after use to ventilate fully — 30–60 minutes of ventilation prevents moisture build-up in the wood
- Use a sauna towel to sit on during use — this significantly reduces how much sweat contacts the bench wood directly
Weekly Cleaning
- Use a sauna-specific cleaner (available from sauna suppliers) or a diluted solution of mild dish soap and water — apply lightly to the bench and wall surfaces with a soft cloth or brush
- Scrub along the wood grain with a soft brush
- Rinse with clean water using a barely damp cloth — do not soak the wood
- Allow to air dry completely with the door open before the next use
Removing Sweat Stains from Wood
- Grey or yellow staining on the bench surface from accumulated sweat: sand lightly with fine-grit sandpaper (220 grit) along the grain — this removes the surface layer of stained wood and reveals clean wood underneath
- Sand only when the wood is dry; always sand along the grain, never across it
Preventing Mould
- Mould in a sauna typically appears on the floor or in corners — it requires persistent moisture; adequate ventilation after every use usually prevents it
- If mould appears: clean with a diluted hydrogen peroxide solution (3%), scrub, and ensure better ventilation; bleach is not recommended on sauna wood as it can damage the wood and leave residue
- Never apply sealant or varnish to the interior wood — it must remain untreated to absorb and release moisture naturally