10 Reasons Why Your Sauna Stinks (How to Fix It)


Saunas are a place of relaxation, serenity, and rejuvenation. They can take us on a journey toward well-being and detoxification.

However, what if you’re confronted with an unpleasant smell each time you step into your sauna? It can be a real mood killer, but don’t worry, you’re not alone!

Many sauna owners face this issue and, most importantly, it’s solvable. Let’s look at the reasons behind that peculiar odor in your sauna and learn how to get your aromatic oasis back.

Mold and Mildew

Mold and mildew growth is a common culprit behind the bad smell in saunas. These microorganisms thrive in warm, humid environments.

If left unchecked, they not only lead to bad odors but can also pose serious health risks.

The Solution

Regularly cleaning and ventilating your sauna can help prevent mold and mildew growth. Use a mild, non-abrasive cleaner to scrub the interior surfaces and allow your sauna to dry completely after each use.

If mold and mildew have already taken up residence, you may need to use a mildew remover or, in severe cases, hire a professional cleaning service.

Sweat and Body Oils

With the use of the sauna comes the inevitable perspiration. Add to this mix the body oils, and you have a concoction that can potentially leave behind a funky smell.

This residue can soak into the wood over time, leaving a lingering odor.

The Solution

The best way to tackle this is to clean the sauna regularly, especially the benches where most body contact occurs.

Encourage sauna users to sit on clean towels, which can absorb most of the sweat and body oils. Finally, for those stubborn odors soaked into the wood, consider lightly sanding the surface.

Improperly Cured Wood

Traditional saunas are usually made of wood, which if improperly cured or treated, can sometimes give off a bad smell when heated.

This is particularly common with certain types of wood or if the wood was not allowed to dry out adequately before the sauna was constructed.

The Solution

If your sauna is relatively new and you suspect that the wood could be the problem, it may be worth contacting the manufacturer or installer.

They can potentially replace the offending panels or suggest appropriate treatment methods. For existing saunas, lightly sanding the interior wood and then treating it with a sauna-friendly sealant can often resolve this issue.

Stale Air

Without adequate ventilation, the air inside your sauna can become stale and start to smell. Proper airflow is essential not just for preventing odors but also for the overall effectiveness and safety of your sauna.

The Solution

Ensure that your sauna’s ventilation system is working effectively. If your sauna doesn’t have a built-in ventilation system, consider installing one.

Simply leaving the door open for a while after use can also help clear out the stale air and allow fresh air to circulate. If a full-blown ventilation system isn’t feasible, consider incorporating a small fan to help move the air around.

Inappropriate Cleaning Agents

Using cleaning products that aren’t suitable for saunas can also lead to unpleasant smells.

The heat inside the sauna can cause certain chemicals to react or simply concentrate the smell of the cleaning product, which can be off-putting.

The Solution

Make sure you’re using a cleaner specifically designed for use in saunas, or at least one that is safe for use on the wood used in your sauna.

A mild detergent or diluted vinegar solution can often be a safe bet. Rinse thoroughly after cleaning to ensure no residue is left behind.

Old or Damaged Heaters

Old or damaged sauna heaters can be another source of unpleasant smells. This can happen when parts become worn out or when debris accumulates over time.

The Solution

Regularly inspect your heater for signs of wear or damage. Keep it clean and clear of any debris. If your heater is old and has seen better days, consider replacing it entirely.

Always ensure professional installation and adherence to safety guidelines when installing a new heater.

Leftover Essential Oils

While it’s enjoyable to introduce aromas into your sauna experience using essential oils or fragrances, these can sometimes leave behind a residue. Over time and with heat, these residues can turn into an unpleasant smell.

The Solution

If you choose to use oils or fragrances, make sure they are ones designed for use in saunas. Never apply oils directly to the wood or the heater.

Instead, add them to the water that you use to create steam. After using fragrances, clean the sauna to ensure no residue is left behind.

Rotting Wood

One of the more serious causes of a bad smell in your sauna could be rotting wood.

This is typically a result of long-term moisture exposure, often coupled with poor ventilation and maintenance.

The Solution

If you suspect that the wood in your sauna is rotting, it’s essential to take immediate action.

Unfortunately, this usually means replacing the affected parts or possibly the entire sauna if the problem is widespread. To prevent wood rot, ensure good ventilation, proper maintenance, and regular inspections.

Water Quality

One potential reason for your sauna developing an unpleasant smell can be the quality of the water you are using.

Water containing heavy minerals or high amounts of chlorine can interact with the heat and humidity inside the sauna, leading to an odd smell.

The Solution

If you suspect water quality could be causing the bad smell, consider having your water tested. In areas with hard water, consider using a water softening system or simply switch to bottled or filtered water for use in the sauna.

To avoid chlorine-related issues, refrain from using pool water or heavily chlorinated water. Routine water testing can ensure the problem does not recur.

Incorrect Sauna Design

The design of your sauna might contribute to unpleasant smells if it does not take into account proper drainage and ventilation

An ineffective drainage system can lead to standing water, which over time can develop a sour smell. Poor ventilation, as discussed earlier, can also contribute to stale and unpleasant odors.

The Solution

If you suspect that the design of your sauna is causing odor issues, it might be time to consult with a professional.

They can suggest modifications that can improve ventilation and drainage. In some cases, installing a new floor drain or adjusting the sauna’s layout can make a significant difference.

Insects and Pests

Insects, rodents, or other pests can sometimes make their way into your sauna, especially if it’s located outdoors or in a remote area of your property.

Not only can they directly contribute to bad smells, but they can also cause damage that leads to other problems, such as rotting wood.

The Solution

Keep an eye out for signs of pests and take action at the first indication of a problem. This might involve setting traps, using natural repellents, or in more severe cases, hiring a professional pest control service.

To prevent pests in the first place, ensure that your sauna is properly sealed and that you’re not leaving food or other attractants nearby.

Old Age and Neglect

Like anything else, saunas can show signs of age, and one of those signs might be an unpleasant smell.

If a sauna has been neglected for a long time, various issues like mold, mildew, and rot can set in, all of which can lead to bad smells.

The Solution

Regular maintenance is key to extending the life of your sauna. But if you’ve inherited an old, neglected sauna, you may need to put in some extra work.

Thoroughly clean the sauna, treat any mold or mildew, and replace any rotten or damaged wood. If the smell persists, you may need to consult with a sauna professional to assess whether further repairs are needed.

Recent Posts