Set up your canvas tent camper.
Wipe the tent with a dry cloth or soft brush, starting at the top and working your way down. Wiping it will help to loosen dirt and grime.
Dip a soft sponge in water, ring it out and use it to wipe the tent. Start from the top and work toward the bottom. Do not over saturate the sponge.
Add a small amount of non-lanolin laundry soap flakes to the water if you have any stubborn stains and repeat Step 3.
Rinse the sponge and wipe the canvas once more to remove any soap.
Leave the tent up until it is dry. Storing a canvas tent while it is still damp might damage it.