Sauna Maintenance Guide

Keep your sauna investment lasting for years with our complete maintenance guide.

Published 3/25/2026

Sauna Maintenance Guide: Keep Your Investment Lasting

A sauna is an investment. Here’s how to maintain it properly so it lasts for decades.

Daily Maintenance

After Each Use

1. Air out the sauna

  • Leave door open 15-30 minutes
  • Let moisture escape
  • Prevents mold and mildew

2. Wipe down benches (if sweaty)

  • Use clean towel
  • Quick wipe is enough

3. Turn off and unplug

  • Saves energy
  • Reduces fire risk

Time required: 2-3 minutes

Weekly Maintenance

Clean the Interior

What you need:

  • Soft cloth or sponge
  • Mild soap (or sauna-specific cleaner)
  • Warm water

Process:

  1. Mix mild soap with warm water
  2. Wipe down benches, backrests, walls
  3. Rinse with clean water
  4. Leave door open to dry

Avoid:

  • Harsh chemicals
  • Bleach
  • Abrasive scrubbers

Time required: 10-15 minutes

Check the Heater

Infrared:

  • Check for dust on heaters
  • Gently vacuum if needed
  • Inspect for damage

Traditional:

  • Check rocks for cracks
  • Replace damaged rocks
  • Clean heater surface

Time required: 5 minutes

Monthly Maintenance

Deep Clean

Process:

  1. Full wipe-down with sauna cleaner
  2. Clean floor thoroughly
  3. Check and clean drain (if present)
  4. Inspect all surfaces for mold/mildew
  5. Treat any problem areas

Time required: 30-60 minutes

Inspect for Issues

Check:

  • Wood condition (cracks, warping)
  • Door seal (tight fit?)
  • Heater operation
  • Electrical connections
  • Ventilation (clear?)

Time required: 15 minutes

Seasonal Maintenance

Every 3-6 Months

1. Sand the benches (lightly)

  • Use fine-grit sandpaper (220+)
  • Remove stains and discoloration
  • Wipe clean

2. Apply wood treatment (optional)

  • Sauna-specific wood oil
  • Protects wood, extends life

3. Deep clean heater

  • Infrared: vacuum thoroughly
  • Traditional: check rocks, clean element

4. Check all seals and gaskets

  • Door seals
  • Window seals (if present)
  • Replace if worn

Time required: 1-2 hours

Wood Care

Cedar (most common)

Pros: Naturally resistant to mold/moisture

Care:

  • Clean regularly
  • Light sanding annually
  • No stain needed (cedar ages naturally)

Hemlock

Pros: Hypoallergenic, affordable

Care:

  • More sensitive to moisture
  • Keep dry between uses
  • May need wood treatment

Basswood

Pros: Hypoallergenic, low odor

Care:

  • Similar to hemlock
  • Keep dry
  • Avoid harsh cleaners

General Tips

  • Never paint or varnish sauna wood
  • No chemical treatments unless sauna-specific
  • Let wood breathe (air out after use)
  • Address stains quickly (before they set)

Heater Maintenance

Infrared Heaters

Daily: No action needed

Weekly: Dust check

Monthly: Gentle vacuum

Annually: Professional inspection

Signs of problems:

  • Uneven heating
  • Strange smells
  • Visible damage
  • Cold spots

Traditional Heaters

Daily: No action needed

Weekly: Check rocks

Monthly: Clean surface

Annually: Professional inspection

Rocks: Replace every 1-2 years (or when cracked)

Common Problems & Solutions

Mold or Mildew

Cause: Excess moisture, poor ventilation

Solution:

  1. Air out after every use
  2. Clean with vinegar solution
  3. Improve ventilation
  4. Consider dehumidifier

Wood Discoloration

Cause: Sweat, oils, UV exposure

Solution:

  1. Light sanding
  2. Keep clean
  3. Use towels on benches

Door Won’t Seal

Cause: Warping, worn gasket

Solution:

  1. Check gasket condition
  2. Replace if worn
  3. Adjust door hinges

Uneven Heating (Infrared)

Cause: Dust, heater damage

Solution:

  1. Clean heaters
  2. Check for damage
  3. Contact manufacturer if needed

Maintenance Schedule Summary

FrequencyTaskTime
After each useAir out, wipe down2-3 min
WeeklyClean surfaces, check heater15 min
MonthlyDeep clean, inspect30-60 min
SeasonalSand benches, treat wood1-2 hours
AnnuallyProfessional inspectionVaries

Pro Tips

  1. Keep towels handy — Use on benches to catch sweat
  2. Leave door open — Always air out after use
  3. No shoes inside — Keeps floor clean
  4. Shower first — Cleaner sauna, less maintenance
  5. Address issues early — Small problems become big ones

When to Call a Professional

  • Electrical issues
  • Heater malfunction
  • Structural damage
  • Mold infestation
  • Gas leaks (wood/gas heaters)

The Bottom Line

Sauna maintenance is simple but important. A few minutes after each use plus regular cleaning will keep your sauna in great condition for decades.

Key habits:

  1. Air out after every use
  2. Clean weekly
  3. Inspect monthly
  4. Address issues early

Result: A sauna that lasts and provides years of reliable use.

Have maintenance questions? Contact us at hello@thethermallife.com