How to Clean a Cedar Sauna: A Complete Maintenance Guide for Long-Term Beauty
A cedar sauna is at its best when the wood can breathe. The heat, the aroma, the feel of smooth grain under your hands – all of that comes from cedar staying clean, open-pored, and well cared for.
Sweat, natural oils, and moisture settle into the surface over time, and a simple cleaning routine keeps the wood fresh and the sauna feeling like a place you want to step into every day.
This guide walks you through everything about how to clean a cedar sauna: what cedar needs, how to clean it safely, and the habits that keep a sauna looking beautiful for years.
Understanding Cedar Wood in Saunas
Before you grab a bucket or a brush, it helps to understand how cedar behaves inside a sauna. It’s one of the few woods that can take high heat, humidity swings, and daily use while aging gracefully. But it still benefits from a little regular care.
Why cedar is ideal for saunas
Cedar naturally resists rot and mildew. Its grain stays stable in high temperatures and it stays comfortable to touch even when the sauna is hot. The aromatic oils in the wood help suppress certain bacteria, which is why cedar holds up better than most species in humid environments.
When cleaned properly, those oils keep the wood feeling smooth and smelling rich.
Common issues to watch for
Every sauna shows signs of use. Cedar can darken where sweat drips, especially along bench edges. You may see mild discoloration on walls near heater zones or floorboards where moisture gathers. In very humid climates, faint mildew spots may appear in corners. None of these are permanent; they’re all manageable with the right cleaning routine.
How often you should clean a cedar sauna
A quick wipe after each use helps more than most people expect. A deeper clean is usually needed once a month for regular users and every two to three months for light use. If you’re running a commercial or shared sauna, weekly deep cleaning keeps everything sanitary and fresh.
How to Clean a Cedar Sauna: Step-by-Step Routine
This is the routine that keeps cedar strong, smooth, and healthy. It’s simple, gentle, and doesn’t require any specialized products.
Without more ado, here’s how to clean cedar wood sauna for long-term beauty:
Step 1: Prepare the space
Make sure the sauna heater is turned off and the room is cool. Open the door to let fresh air circulate. Remove any accessories – buckets, ladles, thermometers, floor mats – so you can clean the cedar without obstruction.
Step 2: Dust and sweep
Loose debris collects in corners and under benches. A soft brush or handheld vacuum with a brush attachment keeps the surface grain clean without scratching it. Avoid stiff bristles; cedar dents easily.
Step 3: Wipe down surfaces
Mix warm water with a small amount of mild, natural soap. Dip a soft sponge or microfiber cloth into the mixture and wipe benches, walls, and floorboards. Keep the cloth damp rather than soaked as cedar absorbs water quickly, so gentle passes work best.
Step 4: Deep clean stains or mildew
For sweat stains or darker patches, a baking-soda paste works well: mix baking soda with a little water until it forms a spreadable paste, gently rub it into the area, and wipe clean.
For mildew: use a 50/50 vinegar and warm water solution. Light pressure is enough; cedar doesn’t need aggressive scrubbing.
Step 5: Rinse and dry
Go over every cleaned area with a cloth dampened in plain warm water. This removes any residue and opens the cedar grain again. When you’re done, keep the door open and let the sauna air out completely.
Step 6: Optional light sanding
If a bench looks tired or has darkened areas that cleaning didn’t lift, sanding brings back the original color. Use 120- to 150-grit sandpaper, applying light, even pressure in the direction of the grain. Vacuum and wipe with a dry cloth afterward.
Step 7: Maintain airflow and scent
Once everything is dry, leave the door open for a while to let the wood breathe. If you want to refresh the cedar aroma, apply a very small amount of natural cedar oil to a cloth and wipe lightly over a section. But skip any heavy oils or sealants that block the pores.
What Cleaning Products Are Safe for Cedar?
Cedar is durable, but it’s also delicate in the sense that anything that clogs its pores or coats the grain works against how a sauna is meant to function. Choosing the right cleaners protects the wood and preserves both its scent and longevity.
Use gentle, natural cleaners
Mild soap, warm water, and simple household ingredients are usually all you need. Natural cleaners won’t leave residue that heats up or releases unwanted smells during a sauna session. They also avoid stripping cedar’s natural oils.
Avoid harsh chemicals and essential oils
Cedar absorbs liquids quickly. Bleach, solvents, ammonia-based sprays, and commercial wood polishes seep into the grain and create lingering odors once the sauna heats up.
Even essential oils – though great in diffusers – can stain or gum up the wood when applied directly. Keep aromatherapy in the air, not on the cedar.
Skip varnishes, paints, or heavy sealants
Cedar is meant to be bare. Anything that seals the grain traps heat and moisture against the surface, shortening the lifespan of the wood. If you’re tempted to “protect” your sauna with varnish, think of it this way: the cedar is already doing the protecting. A simple routine sauna clean keeps it healthy.
Cedar Sauna Maintenance Tips Between Uses
A cedar sauna ages beautifully as long as it gets a few simple habits from its owner. These aren’t time-consuming; they’re part of a rhythm that keeps the space feeling inviting every time you step in.
Leave the sauna door open after sessions
Airflow lets the cedar dry fully. This prevents moisture buildup, odor, and mildew, especially in corners and bench seams.
Use towels when sitting
A clean towel absorbs sweat before it hits the wood. It’s the easiest way to keep cedar bright, and it reduces how often you need to deep clean.
Rotate accessories regularly
If you use thermometers, ladles, buckets, or backrests, move them slightly between sessions. Sitting in one spot too long can lead to subtle discoloration. Small shifts keep the color even across the sauna.
Keep the floor clean
Floors collect more dirt and oils than people realize. A quick sweep and wipe keeps debris from grinding into the cedar or collecting in the joints.
Mistakes to Avoid When Cleaning Cedar Saunas
Cedar is resilient, but the wrong cleaning habits can shorten its lifespan. Avoiding these pitfalls will keep your sauna looking and performing its best.
Avoid harsh cleaners or “strong” natural products
Bleach, ammonia, citrus oils, heavy-duty degreasers, and abrasive powders damage cedar. They strip natural oils and leave residues that release odors when heated.
Don’t trap moisture inside
Closing the door immediately after a session is one of the biggest mistakes. Cedar that never fully dries becomes musty, and stains set in faster. Keeping the door open after use prevents this.
Skip polyurethane, varnish, or any protective coatings
Many homeowners assume a sealant will “protect” cedar. In a sauna, the opposite is true. Sealants trap heat and moisture beneath the surface, creating bubbling, cracking, and long-term rot.
Don’t power wash or soak the wood
Too much water is worse than too little. A heavy soak pushes moisture deep into the grain and leads to swelling. Keep cleaning minimal and intentional.
When to Refinish or Replace Cedar Components
Even well-maintained cedar eventually shows its age. Knowing when to restore a piece and when to replace it keeps your sauna safe and beautiful.
Refinish when discoloration becomes widespread
If sanding reveals bright cedar underneath, refinishing is all you need. Benches and backrests are easy candidates for restoration because they naturally darken first.
Replace when wood becomes soft or splintered
Soft spots, splinters, sagging bench boards, or areas that feel spongy indicate moisture damage beyond surface cleaning. These pieces should be swapped for new cedar to maintain safety and structural integrity.
Assess heater guards and floor panels more often
These take the brunt of heat and weight. If the guard feels brittle, or floor panels wobble or separate, addressing them early prevents accidents.
If in doubt, replace high-contact areas sooner
The beauty of cedar is its longevity, but comfort matters. If a bench feels rough even after sanding, replacement is well worth the upgrade.
Other Frequently Asked Questions (FAQs)
Where to buy cedar wood for a sauna?
High-quality cedar matters. Look for clear Western Red Cedar, free of knots, sourced from reputable mills. This ensures durability, aroma, and stability under high heat.
If you need replacement boards, trim pieces, or components for repairs, NW Immersion supplies cedar specifically graded for sauna use. Because we build saunas ourselves, everything we source meets the standards we use in our own models.
Do you have to use cedar in a sauna?
No, but cedar is the wood that checks every box. It resists heat, moisture, mold, and warping better than softwoods like pine or spruce. Cedar also stays comfortable to the touch, holds its shape, and won’t release harsh odors when heated.
Many woods can be used, but few match cedar’s longevity and comfort.
Does a sauna have to be cedar?
Not strictly, though cedar is considered the gold standard. Some indoor saunas use hemlock or basswood for budget reasons. Outdoor saunas, however, benefit greatly from cedar because it performs well in humid, rainy, or cold climates.
If your goal is a long-lasting, low-maintenance sauna, cedar is the most reliable choice.
Do you seal cedar in a sauna?
No. Cedar should never be sealed with varnish, polyurethane, or synthetic finishes. These products trap moisture, which can lead to cracking, blistering, and long-term damage.
However, a breathable treatment like Livos all-natural sauna oil can be safely used inside a sauna. Livos does not seal the wood. It allows cedar to breathe naturally while helping protect the surface, support its antimicrobial properties, and maintain its appearance over time. The interior should remain lightly treated, not coated, so the wood can continue to regulate heat and moisture as intended.
How to clean cedar sauna benches
Benches collect the most sweat and oils, so a simple routine works best:
- Wipe down after each session with a damp cloth.
- Once a month, clean with warm water and mild soap.
- If stains appear, use fine-grit sandpaper to refresh the surface.
Avoid scrubbing with abrasive pads or soaking the bench with excess water.
Is cedar good for saunas?
Yes, it’s the industry benchmark for a reason. Cedar resists moisture and mildew, holds its shape in heat, smells clean and natural, stays comfortable to sit on, ages beautifully instead of deteriorating. Finally, its durability and comfort make it the preferred wood for both indoor and outdoor builds.
How to build a cedar sauna?
- Plan your layout: choose size, bench layout, and heater type.
- Frame the structure: typical 2×4 or 2×6 framing.
- Add insulation: mineral wool for heat retention.
- Install vapor barriers: foil-faced is standard for saunas.
- Add cedar cladding: tongue-and-groove panels for walls and ceilings.
- Install benches and heater: follow heater manufacturer safety distances.
- Set up ventilation: fresh air intake + exhaust path.
- Add lighting and accessories: keep them sauna-rated.
For those who prefer a professionally built sauna, NW Immersion builds cedar saunas by hand, including custom designs and prebuilt models.
Can I use essential oils or aromatherapy inside a cedar sauna?
Yes, but never apply oils directly to the cedar. Use a ladle and water on the heater rocks or place oils in a heat-safe cup. Direct contact with wood can stain it permanently.
How long does cedar last in a sauna?
With proper care, cedar can last 15–30 years or more. Most replacements are from wear and tear, not structural failure. A light sanding every few years extends its lifespan dramatically.
Ready to Start Your Cedar Sauna Project?
Cedar rewards the people who care for it. Clean your sauna, keep it dry, and it will hold its warmth, scent, and beauty for years. When you’re ready to build or upgrade your own cedar sauna, NW Immersion is here with the same materials we trust in our handcrafted models.
If you need guidance, replacement cedar, or a full build, we’re always a message away. Call or text us at (360) 667-8778.