Check out our article on retreating your canvas tent with a waterproofing spray for more tips.

How to Spot Clean a Canvas Tent

Cleaning a canvas tent takes patience, time, and a bit of elbow grease. Not every stain responds the same way, and some cleaning methods can do more harm than good. Always test any treatment on a small, inconspicuous area first, such as the tent bag or a hidden section of canvas.

Step 1: Perform a quick “dry cleaning” of the canvas. 

Start by brushing off as much dirt and loose debris as possible using a soft-bristle brush, sponge, or dry rag. A clean vacuum can also help remove loose material from the surface.

The goal is to remove as much as possible before introducing water or cleaning products.

Step 2: Cross your fingers and scrub with soap and hot water. 

Mix warm water with a mild detergent or soap and repeat the cleaning process with the same soft brush, sponge, or rag. Good options include gentle soaps like dish soap, baby shampoo, or mild laundry detergent.

Once you’ve scrubbed the area, rinse thoroughly with clean water. Soap residue can become food for mold, so it’s important to remove it completely.

Step 3: Take a Break. 

If the stain is still there, pause, breathe, and don’t get discouraged. Some stains simply take multiple passes.

Step 4: Try again.

Repeat the cleaning process as needed. Patience usually gets better results than force.

Step 5: Let dry in the sun.

Once the area is clean, let it dry completely in the sun if possible. Full drying is essential before storage or retreating the canvas.

If that didn’t remove everything, use a dedicated mold and mildew remover designed for canvas, like Iosso Mold and Mildew & Stain Remover and apply it multiple times. We find it to the best bet to get out most tough organic strains, safely.

After scrubbing, we highly recommend applying some canvas guard to add back waterproofing. 303 Fabric Guard, non-toxic Dry Guy waterproofing spray, and Hawk Tools waterpoofer are 3 safe and effective products for protecting your canvas.

Removing Mold from a Canvas Tent

Mold removal is more difficult than basic cleaning, but it can often be managed with the right approach and enough time. The key is to avoid harsh chemicals that can weaken the fabric, damage stitching, or strip protective coatings.

Some people recommend bleach solutions, but bleach should generally be avoided unless absolutely necessary. It can be too aggressive for canvas and may shorten the life of the tent.

Steps to Remove Mold:

1. Dry-scrub the affected area with a soft bristle brush or sponge.

2. Spray the mold with a mixture of 1 part distilled white vinegar to 3 parts water and let it dry.

3. Use Iosso Mold and Mildew & Stain Remover. This is our go-to product. It is gentle on canvas and has historically been the most reliable.
   
   Follow the on-pack instructions. Try spot cleaning with a hot-water mixture in a spray bottle, or create a solution in a bucket and apply with a sponge. Don’t be alarmed if all of the mold hasn’t been removed yet.

4. Let it dry in direct sunlight.

5. Apply another treatment and let dry. You may need to repeat this a third time.

6. Rinse and let dry.

Once the mold is removed, retreat the canvas with a waterproofing product.

Soaking Your Canvas Tent Clean

If the tent is heavily covered in mold or dirt, spot cleaning may not be enough. In that case, a full soak can be the best option. This is a bigger project and may take two to three days between prep, soaking, rinsing, drying, and retreating the fabric.

Before starting, make sure the weather forecast shows several dry, warm days, and gather all the tools you’ll need.

Tools and Products to Gather:

• 55 gallon capacity container (such as a drum, trash can, a kiddie pool, etc)
• a 3 or 5 lb. container of Oxyclean
• Access to warm water with a hose attachment (hose from laundry room?)
• A sturdy stick (without sharp edges)
• Tent "drying rack" (i.e. saw horses, chairs, tables, ladders etc).
• Dry Guy or 303 Fabric Guard waterproofing
• At least 2 people

Tent Cleaning Process:

1. Remove the floor from the tent and set aside (might as well clean it).
2. Fill container 1/4 to 1/3 full of warm water (the hotter the better).
3. Add about 3 lbs of Oxyclean & stir until dissolved.
4. Place canvas fabric inside of container.
5. Add more warm water until canvas is submerged.
6. Agitate ("stir") the canvas and water with a large (dull) stick.
7. Cover the container (optional to retain the heat and keep leaves out).
8. Let soak for 5-12 hours, periodically agitating the canvas and water with the stick/pole.
9. Pour out the water (oxyclean should be kind to the soil).
10. While still in the container, thoroughly rinse off the canvas, and out, the container. Rinse really well. Really well.
11. Inspect. If necessary, repeat the process a 2nd time.
12. Bring the container to chosen location and remove the canvas to allow it to dry - avoiding contact with dirt (laying a tarp down is wise to protect the canvas).
1. Carefully extend the canvas over sturdy support structures (note it will be heavy). If you extend it over a vehicle, make sure it is protected with a tarp.
2. Perform another light rinse if possible.
13. Allow the canvas to become 80%-90% dry (so a hot day is best).
14. Place the canvas on top of the tent floor and attach back to the canvas.
15. Erect the tent and let dry.
16. Apply a waterproofing treatment to add back waterproofing / UV protection.

Once complete, the tent should be clean, dry, and ready for continued use. Good airflow inside the tent during drying will also help reduce humidity and prevent future mold growth.