Your sauna is built to handle heat and sweat — that’s what it’s designed for. But standing water and persistently wet surfaces can lead to a shorter lifespan for the sauna. Left unmanaged, moisture sitting on wood is the primary cause of premature wear, staining, and mold growth over the life of the sauna.

The good news is that prevention is simple and takes less than five minutes after a session.

If You’re Coming From a Cold Plunge or Wet Area

Sauna and cold plunge contrast therapy is one of the best pairings in wellness — but stepping dripping wet straight into a wood sauna brings a significant amount of water into the cabin. This is the highest-risk scenario for moisture buildup and is worth taking seriously, especially in a commercial setting where it’s happening many times a day.

• Towel off before entering. Take 30 seconds to dry off before stepping in. This one habit alone dramatically reduces how much water ends up on the floor and bench.
• Use the provided floor mat. The floor mat is there for a reason — it catches drips and protects the wood floor from direct water contact. Keep it in place during every session.
• Lay a towel on the bench. A towel or bench cover between you and the wood gives the bench surface the same protection. It also makes cleanup easier.

After Every Session: Wipe Down the Interior

This is the single most effective thing you can do to extend the life of your sauna.

⚠ Important: Wipe down the bench, backrests, side rests, and floor after every use. This is especially critical in commercial settings where the sauna sees back-to-back sessions throughout the day. Moisture that’s allowed to sit and soak into the wood will cause discoloration, swelling, and eventually mold far sooner than normal wear and use would.

Use a clean, dry cloth or towel and go over all surfaces the body was in contact with. It takes about two minutes and makes a significant difference over time.

Leave the Door Ajar After Use

Once a session is done and the sauna is cooling down, prop the door slightly open. This allows air to circulate through the cabin and moisture to escape rather than condensing on the walls and floor as the temperature drops. Even a few inches is enough.

Open the Vents During Use

Keeping the vents open while you’re inside the sauna maintains airflow and prevents humidity from building up inside the cabin. If you’re entering from a cold plunge or bringing extra moisture in, open all three vents at the start of your session rather than waiting.

Commercial Settings: Build It Into Your Routine

For facilities running multiple contrast sessions per day, moisture management should be part of your standard operating procedure between guests — not just end-of-day cleaning.

• Post a towel-off reminder at the sauna entrance.
• Keep dry towels and a clean cloth accessible at the sauna.
• Assign a wipe-down as part of the turnover process between each guest.
• Leave the door open between sessions to air out the cabin.

Tip: A few minutes of consistent upkeep after each session will do more to preserve your sauna than any deep cleaning schedule.

Note: If you do notice early signs of discoloration, light sanding with fine-grit sandpaper can remove surface staining before it sets in. See the How to Clean Your Infrared Sauna guide for more on maintaining the wood interior.