Mould on canvas is something most camper trailer and caravan owners will deal with at some point, especially in Australia’s humid and coastal regions.
We first experienced it ourselves after extended wet weather, and it quickly became clear how fast mould can take hold if canvas isn’t completely dry. It doesn’t take long for small patches to spread, and if left untreated, it can cause permanent staining and damage.
The last thing I thought I would need to be doing was cleaning mould off canvas!
Mould on canvas is something most caravanners and camper trailer owners deal with at some point, especially in Australia’s humid and coastal environments.
Since travelling full-time around Australia, we’ve seen firsthand how quickly mould can develop and how important it is to deal with it properly to prevent permanent damage. This guide has been reviewed and updated to reflect current best practices and what actually works on the road.
Rain, Rain And More Rain
We discovered just how easily mould can develop when moisture finds its way inside, even when everything appears to be sealed properly. In our case, water had entered through the tailgate area and created damp conditions inside the camper. At first glance, the canvas itself looked fine, but once we opened the rear and inspected the kitchen area, mould had already started forming on surfaces and gear stored inside.
This was a valuable lesson in how quickly mould can take hold in enclosed spaces. Even small amounts of trapped moisture can create the perfect environment for mould to develop, particularly in warm and humid conditions. Items like camp chairs, canvas, and internal surfaces are all vulnerable if moisture isn’t detected and addressed early.
Since then, we’ve made it a habit to regularly inspect seals, ensure everything is completely dry before storage, and check inside the camper after rain or humid weather. Catching mould early makes removal far easier and prevents long-term damage.
Cleaning Mould From Camper Trailer Canvas And Surfaces
Cleaning Mould From Camper Trailer Canvas And Surfaces
As soon as you discover mould, it’s important to act quickly. The longer it sits, the harder it is to remove and the greater the risk of permanent staining or damage.
Here’s the process we followed to safely clean and restore our camper trailer:
Remove All Affected Gear
Take everything out of the camper or trailer so you can properly inspect all surfaces. This also prevents mould spores from spreading further.
Clean Hard Surfaces First
Wipe down internal surfaces such as kitchen areas, benches, and storage compartments using a mild cleaning solution. A diluted bleach solution can be effective for killing mould spores on hard, non-porous surfaces. Always wipe surfaces thoroughly and allow them to dry completely.
Wash Affected Gear
Items such as camp chairs, mats, and cooking equipment should be washed and dried thoroughly. Sunlight is especially effective, as UV exposure helps kill mould spores and remove moisture.
Inspect Seals And Entry Points
Check tailgate seals, canvas joins, and any potential water entry points. Addressing the source of moisture helps prevent the problem from returning.
Allow Everything To Dry Completely
This is critical. Moisture is what allows mould to grow. Leave the camper open in a well-ventilated area or direct sunlight until all surfaces and gear are completely dry.
Our Advice For Safely Removing Mould From Canvas
After speaking with manufacturers, canvas specialists, and seeing firsthand how mould affects camper trailers and annexes, the most important principle is to clean mould safely without damaging the canvas itself.
Canvas used in camper trailers and caravan annexes is treated with waterproofing agents, UV protection, and mould inhibitors. Using harsh chemicals or incorrect cleaning methods can strip away these protective treatments and shorten the life of your canvas.
Mould can also pose health risks, particularly for people with asthma, allergies, or respiratory conditions. Addressing mould early protects both your equipment and your health.
Based on manufacturer guidance and real-world experience, this is the safest and most effective method.
Open The Camper And Allow It To Fully Dry
Set up your camper trailer or annex in a well-ventilated area, preferably in direct sunlight. Open all doors, windows, and flaps to allow maximum airflow. The canvas must be completely dry before attempting to remove mould.
Brush Off Dry Mould Spores
Once the canvas is fully dry, use a soft or stiff bristle brush to gently remove surface mould spores. Brushing while the canvas is dry prevents spreading mould deeper into the fabric.
Vacuum Remaining Spores
Vacuum the affected areas to remove any remaining loose spores. This helps prevent regrowth and ensures spores are not left embedded in seams or folds.
Apply A Vinegar Cleaning Solution
Mix one part white vinegar with ten parts water. Vinegar is effective at killing mould spores while being safe for canvas when used correctly.
Apply the solution using a soft brush, broom, or cloth. Gently work the solution into the affected areas without soaking the canvas excessively.
Allow The Canvas To Dry Completely Before Packing Away
Once cleaned, allow the canvas to dry fully in sunlight and fresh air. Never pack away canvas while damp, as this creates the conditions for mould to return.
Avoid Using Harsh Chemicals Or Pressure Washers
Do not use bleach, harsh detergents, mould removers, or pressure washers on canvas. These can damage waterproof coatings, weaken the fabric, and reduce the lifespan of your camper trailer or annex.
Using gentle cleaning methods and ensuring the canvas is completely dry is the safest long-term approach.
How To Restore Waterproofing On Canvas
If mould has been cleaned using harsh chemicals, pressure washing, or incorrect cleaning methods, the waterproof coating on your canvas may be reduced or damaged. This can leave the canvas more vulnerable to future mould growth and water penetration.
Fortunately, waterproofing can usually be restored using a purpose-made canvas reproofer such as Dynaproof or similar products recommended by canvas manufacturers.
These products are designed specifically for camper trailer and annex canvas and help restore water resistance while maintaining the flexibility and breathability of the fabric.
How To Apply Canvas Reproofer
Canvas reproofer is typically water-based and easy to apply. Always follow the manufacturer’s instructions, but the general process is straightforward.
Apply the reproofer using a brush, roller, or spray, ensuring even coverage across the affected areas. The canvas must be clean and completely dry before applying the product.
Once applied, allow the canvas to dry fully before folding or storing your camper trailer or annex.
Inspect For Structural Damage
In many cases, mould looks worse than it actually is. Once properly cleaned and dried, most canvas and internal surfaces recover well without permanent damage.
Materials such as marine-grade plywood, commonly used in camper trailer kitchens and storage areas, are designed to withstand moisture exposure and often dry out without long-term issues.
The key is acting quickly, drying everything thoroughly, and restoring waterproof protection where needed.
How To Prevent Mould From Returning
Prevention is far easier than dealing with mould after it has taken hold. Moisture, humidity, and lack of airflow are the main causes of mould growth in camper trailers and caravan annexes.
Whenever possible, allow your camper or annex to dry completely before packing it away. Even small amounts of trapped moisture can create the conditions mould needs to develop.
If your camper trailer has been exposed to rain, high humidity, or coastal conditions, it’s worth opening it up once the weather clears to allow fresh air and sunlight to circulate through the canvas.
Use A Protective Cover When Stored Outdoors
If your camper trailer is stored outside, using a high-quality breathable cover or tarp can help protect it from prolonged rain exposure. This reduces the risk of water entering through seals, joins, or vulnerable areas.
Regular inspections are also important. Checking your camper periodically allows you to identify moisture or mould early, before it becomes a larger problem.
Make Canvas Maintenance Part Of Regular Travel Preparation
Canvas maintenance is simply part of owning a camper trailer or caravan. Staying on top of drying, ventilation, and regular inspections will protect your investment and extend the life of your setup.
A few simple preventative steps can save significant time, cost, and frustration in the long run, and ensure your camper is always ready for the next trip.
What We’ve Learned After Years On The Road
Since leaving the driveway and travelling full-time around Australia, keeping canvas in good condition has been essential. We’ve met many travellers who didn’t realise how quickly mould can take hold, especially after humid weather, rain, or storing their camper or annex while damp.
The biggest lesson is that prevention is far easier than removal. Ensuring canvas is completely dry before packing away, improving ventilation, and checking regularly for early signs of mould makes a huge difference.
We’ve also seen the long-term damage caused when mould is ignored. In severe cases, canvas can weaken, stain permanently, and require costly replacement. Taking the time to clean and protect it properly not only extends its life but protects the value of your setup.
This is one of those maintenance tasks that becomes part of normal life on the road, and staying on top of it will save you money and frustration over time.
With years of experience travelling Australia in a caravan, I’m passionate about helping others embark on their own unforgettable adventures. From off-grid camping tips to expert advice on planning the ultimate big lap of Australia, I share stories, practical hacks, and inspiration to make your journey stress-free and exciting. Whether you’re a seasoned traveller or just starting out, join me as I explore the beauty of Australia, one road at a time!
Hi there van u tell me the best way to get mould off a swag
Hi Danile
If it’s a canvas swag follow the same directions as for the camper trailer canvas.
If you spray the canvas awning with vinegar or clover do you have to protect the windows as they can not have any cleaner on them will make them cloudy etc?
Hi Alison..I can’t answer that sorry. What are your windows made of? Can you do a patch test on them first?
Can’t get the mould stains off the canvas on my camper trailer.
PLEASE HELP AN OLD LADY
Unfortunately if it has got to the stage that the mould has caused a stain, you may not be able to remove it. All I can suggest is that you try the white vinegar and water and a brush and see if that helps. Don’t scrub to hard as this can damage the waterproofing. Make sure you let it dry thoroughly before packing it up.
We had dried mould black spots on canvas after killing it with vinegar. Cleaned off black stains so easy with ‘30 Second Cleaner ‘ from Bunnings. Fantastic for cleaning mould and lichen off caravan as well
Unfortunately products such as the one you mentioned can damage the waterproofing on canvas so be cautious when using them.
Hello, just wondering was it the 30 second outdoor cleaner you used? I’m thinking of trying this and then waterproofing again?
Hi I brought a camper for my brother and when I got it home to make sure everything was there there was so much mold on it. I brought some oil of cloves to get rid of it. Will this hurt the canvas at all?
Thanks
I have never used Oil of Cloves. I have always just been told to use diluted vinegar and a stiff brush.
Hi I have black charcole marks on my canvas swag was wondering how I could remove it??? Without damaging…..
Hi Shelby…I’m not sure about that one. You could maybe try brushing it first with a stiff bristle brush and then sponge it with a weak solution of white vinegar and water and then allow to dry in sun. Let me know how you get on.
I purchased a campervan and a novice at this was not aware of the mold in it and also live in Seast qld I have done 2 trips this year and have both had severe chest infections currently still on medication I believe it is caused by mold in the camper and I cant wait to put it up and treat it and go again just to see the end results [sick or not.Earlier this year in Mackay cyclone and June on trip out west but both ended with flu and chest infections So breakout the vinegar to start with Im glad I persisted with my enquiries John
I hope you have some success in removing it all John.
I,m going to try the white vinegar on the inside flaps on windows of our pop up camper. Had put it down to bring home in rain and set it back up and mold had formed on the window flaps.will give follow up.
Thanks Mary….give the mould spots a good scrub with a stiff bristle brush first. I’m sure it will clean up just fine.
White vinegar works great for mould as well any mould stains just dampen a cloth with vinegar and wipe affected area it just wipes straight off with no scrubbing. Try it I was amazed I know you will be too.
How much vinegar to water?
About 1 part vinegar to 4 parts water. You don’t want the mixture to strong.
A very timely post indeed. We just discovered a wee bit of unusual colouring on our canvas. Our last trip the canvas was completely saturated, but we thought it was very dry when packed away … there was obviously some moisture left. It just took 14 days. 🙁 I will definitely try what’s been recommended … don’t want to damage my canvas.