How to Clean Mould and Mildew from a Tent
Discovering mould or mildew on your tent after a camping trip can be frustrating, particularly if the tent has been stored away for several months.
Black spots, discoloured fabric and unpleasant musty smells are common signs that moisture has remained trapped inside the tent during storage.
Although minor mould growth can sometimes be cleaned successfully, removing it requires care. Tent fabrics often have specialist waterproof coatings and water-repellent treatments that can be damaged by unsuitable cleaning products.
This guide explains how to clean mould and mildew from a tent, which products to avoid, when damage may be permanent and how to prevent mould developing again.
What Causes Mould and Mildew on Tents?
Mould is a type of fungus that grows in damp conditions, particularly where moisture, suitable temperatures and organic material are present.
Tents can provide favourable conditions for mould growth when they are packed away wet or stored in poorly ventilated environments.
Common causes include:
- Packing away a wet tent: Rainwater, dew or condensation becomes trapped inside the storage bag.
- Inadequate drying: The flysheet may feel dry while seams, guy lines or folded areas remain damp.
- Poor storage conditions: Damp garages, sheds and other humid locations encourage mould growth.
- Dirt and organic debris: Mud, leaves and other contaminants can provide material on which mould can grow.
- Long-term storage: A small amount of trapped moisture can become a bigger problem when a tent remains packed away for months.
The UK's often damp climate makes proper drying and storage particularly important.
How to Recognise Mould and Mildew on Tent Fabric
Mould and mildew may appear as:
- Black, green, grey or brown spots on fabric.
- Patchy discolouration.
- A persistent musty or earthy smell.
- Visible growth around seams, folds or poorly ventilated areas.
However, not every stain or unpleasant smell is caused by mould.
Some older tents develop a sticky surface, flaking coating or unusual odour because the waterproof coating is deteriorating.
This is particularly relevant to certain polyurethane-coated fabrics, which can break down over time.
Cleaning may remove surface contamination, but it cannot necessarily restore a waterproof coating that has deteriorated.
Can You Remove Mould from a Tent?
Minor surface mould can sometimes be removed using careful cleaning and a suitable product.
However, the outcome depends on several factors:
- How extensive the growth is.
- How long the tent has remained damp.
- The type of tent fabric and waterproof coating.
- Whether the mould has caused permanent staining or material damage.
- Whether the tent can be cleaned and dried thoroughly.
Even after cleaning, some staining or odour may remain.
Cleaning also cannot guarantee the complete removal of mould from deeply affected materials.
If the tent has extensive visible growth, badly deteriorated fabric or a persistent musty smell, replacement may be more appropriate.
What You Need to Clean Mould from a Tent
Before starting, gather the following equipment:
- A soft sponge or non-abrasive cloth.
- A soft brush suitable for delicate outdoor fabrics.
- Clean, lukewarm water.
- A specialist tent cleaner compatible with the fabric and coating.
- A clean towel or absorbent cloth.
- Suitable protective gloves.
- A well-ventilated outdoor area where the tent can be pitched and dried.
For significant visible mould growth, avoid disturbing the material unnecessarily. People with mould allergies, asthma or other respiratory sensitivities should take particular care and consider having someone else assess the tent.
Always check the tent manufacturer's care instructions before applying any cleaning treatment.
How to Clean Mould and Mildew from a Tent
Step 1: Pitch the Tent Outdoors
Set up the tent in a well-ventilated outdoor location, preferably during dry weather.
This makes it easier to inspect the fabric and identify affected areas without spreading loose material around your home.
Choose a sheltered location where the tent can remain pitched while cleaning and drying.
Avoid prolonged exposure to strong sunlight, as ultraviolet light can gradually weaken tent fabrics and coatings.
Step 2: Inspect the Extent of the Damage
Examine the flysheet, inner tent, groundsheet and seams.
Look for visible mould, staining, damaged stitching, peeling seam tape or signs of deteriorating waterproof coatings.
Pay particular attention to areas where fabric has been folded or remained damp during storage.
If the fabric is extensively affected, fragile, sticky or visibly breaking down, cleaning may not be enough to restore the tent to a usable condition.
Step 3: Remove Loose Dirt Carefully
Use a soft cloth or sponge to remove loose dirt and debris without aggressively brushing or scraping affected areas.
Avoid dry brushing visible mould, as this can release spores into the air.
Do not use stiff brushes, abrasive pads or excessive pressure, which may damage the fabric or waterproof coating.
Step 4: Clean with a Suitable Tent Cleaner
Choose a specialist cleaner approved for the type of tent fabric and waterproof coating.
Follow the product manufacturer's instructions regarding dilution, application, contact time and rinsing.
Where the instructions allow:
- Test the cleaner on a small, inconspicuous area.
- Apply it gently using a soft sponge or cloth.
- Work carefully over the affected fabric without aggressive scrubbing.
- Allow the recommended treatment time.
- Rinse or wipe away residue as instructed.
Some tent cleaners are designed primarily to remove dirt and general contamination rather than treat mould specifically.
For visible mould, use only a product whose manufacturer confirms that it is suitable for the intended treatment and tent material.
Never mix different cleaning chemicals.
Step 5: Rinse Where Required
If the cleaning product requires rinsing, use clean water and follow its instructions carefully.
Remove any remaining cleaning residue without saturating the fabric unnecessarily.
Avoid using high-pressure washers, which can damage coatings, seams and lightweight materials.
Step 6: Dry the Tent Thoroughly
Once cleaning is complete, allow the tent to dry fully in a well-ventilated location.
Drying may take longer than expected, particularly around seams, reinforced areas and folds.
Make sure the following components are completely dry:
- Outer flysheet.
- Inner tent.
- Groundsheet.
- Seams and reinforced attachment points.
- Guy lines and webbing.
- Storage bags and accessories.
Do not use direct heaters, tumble dryers or other high-temperature drying methods unless specifically permitted by the tent manufacturer.
Allowing a tent to dry in moving air is generally preferable to exposing it to prolonged intense sunlight.
Step 7: Check the Tent Again
After the fabric has dried, inspect the cleaned areas.
Check for remaining visible growth, persistent odours, damaged coatings and weakened material.
If mould remains, do not repeatedly apply stronger or improvised chemical treatments without checking compatibility.
Contact the tent manufacturer or a specialist outdoor equipment repair service for further advice.
Can You Use Vinegar to Remove Mould from a Tent?
White vinegar is often recommended as a household mould cleaner, but it is not universally suitable for tent fabrics.
Its acidity may be incompatible with some coatings, finishes, adhesives or components.
For this reason, we would not recommend applying vinegar to a tent unless the tent manufacturer specifically approves its use.
The same caution applies to lemon juice and other acidic household cleaning solutions.
Can You Use Baking Soda on Tent Fabric?
Baking soda is sometimes suggested for removing stains and odours, but abrasive pastes and residues may be unsuitable for coated tent materials.
Scrubbing with a baking soda paste can also damage delicate fabrics or surface treatments.
Use a cleaner designed for the tent's material rather than relying on an improvised household treatment.
Should You Use Bleach to Clean a Mouldy Tent?
Do not use household bleach on tent fabric unless the manufacturer explicitly recommends it.
Bleach can damage some textile fibres, colours, stitching and waterproof coatings.
It may also create hazardous fumes, particularly if mixed with other cleaning products.
Ordinary laundry detergents, fabric conditioners and strong household cleaners should also be avoided unless specifically approved for the tent.
Does Sunlight Kill Mould on Tents?
Sunlight and dry conditions can help remove moisture from tent fabric, but leaving a tent in the sun should not be relied upon as a method of eliminating mould.
Ultraviolet radiation can also weaken fabric fibres and degrade some waterproof coatings over time.
For drying, choose a well-ventilated location with suitable weather protection rather than leaving the tent exposed to intense sunlight for extended periods.
Can Mould Damage a Tent's Waterproofing?
Prolonged damp storage and contamination can contribute to the deterioration of tent materials.
However, it is important to distinguish between surface mould and damage to the waterproof coating.
A tent may develop:
- Surface staining: Discolouration that remains after cleaning.
- Damaged water repellency: Water no longer beads effectively on the outer fabric.
- Peeling seam tape: Adhesive seam treatments begin to separate.
- Coating deterioration: Waterproof coatings become sticky, flaky or damaged.
These problems do not all have the same solution.
Applying a water-repellent spray may help restore surface water beading on compatible fabrics, but it will not necessarily repair a deteriorating waterproof coating.
Similarly, seam sealant can help address certain leaking seams but will not repair extensive fabric degradation.
For more detailed advice, read our Tent Repair and Maintenance Guide.
How to Remove Musty Smells from a Tent
A musty smell may indicate that a tent has been stored damp, although odours can also result from the breakdown of certain waterproof coatings.
Start by pitching the tent outdoors and allowing it to air thoroughly.
Inspect the fabric for visible mould and check the condition of the coatings.
If cleaning is appropriate, use a compatible specialist product and allow the tent to dry completely.
Avoid masking persistent odours with perfumes or heavily fragranced household cleaning products.
If a strong smell remains after appropriate cleaning and drying, especially where the fabric feels sticky or the coating is peeling, the material may have deteriorated beyond practical repair.
How to Prevent Mould and Mildew on Tents
Prevention is generally much easier than trying to clean mould from a badly affected tent.
1. Never Store a Wet Tent
This is the most important rule of tent care.
If you have to pack your tent away wet after camping, unpack it as soon as possible when you return home.
Pitch it or hang the components in a suitable ventilated area until completely dry.
2. Clean Your Tent Before Long-Term Storage
Remove mud, leaves, food residues and other contamination before storing your tent.
Use appropriate cleaning methods and ensure no cleaning product residue remains.
3. Choose a Dry Storage Location
Store your tent somewhere cool, dry and protected from excessive heat and sunlight.
A dry indoor cupboard or storage area is generally preferable to a damp shed or garage.
Where practical, store the tent fabric loosely rather than tightly compressed for long periods.
4. Keep Components Dry
Check that poles, pegs, guy lines, groundsheets and storage bags are dry before packing them together.
Moisture from a single damp component can affect the surrounding fabric during storage.
5. Ventilate Your Tent While Camping
Good ventilation helps reduce condensation, one of the main sources of moisture inside tents.
Use the tent's ventilation openings as conditions allow and keep wet equipment away from sleeping areas where practical.
For more advice, see our How To Avoid Tent Condensation guide.
6. Check Stored Tents Periodically
If your tent is stored for several months, inspect it occasionally for dampness, unusual odours or signs of material deterioration.
Identifying a storage problem early may prevent more extensive damage.
Can You Still Use a Tent That Has Had Mould?
A tent with minor surface contamination may remain usable after appropriate cleaning, provided the fabric and coatings are in sound condition.
However, a tent with extensive mould, persistent contamination, weakened fabric or badly deteriorated waterproofing may no longer provide reliable shelter.
Consider replacement or professional assessment if:
- Visible mould remains after suitable cleaning.
- A strong musty smell persists.
- The fabric has become weak or fragile.
- Waterproof coatings are peeling or breaking down.
- Seams or structural attachment points are damaged.
- You are concerned about exposure to remaining mould contamination.
Do not assume that removing visible stains means all contamination has been eliminated.
Final Advice on Cleaning Mould from Tents
Finding mould or mildew on your tent doesn't automatically mean it needs replacing, but careful cleaning is essential to avoid making the damage worse.
Always start by checking the manufacturer's care instructions, use cleaning products compatible with the fabric and avoid aggressive household chemicals.
Once cleaned, make sure every part of the tent is completely dry before storing it.
Most importantly, remember that preventing damp storage is the best way to avoid mould in the first place.
For more advice on extending the life of your camping equipment, explore our Tent Repair and Maintenance Guide or browse our tent repair and maintenance products.