The oven cover is made of a fully coated Acrylic fabric. It is 100% waterproof.
Whenever you need to clean the cover you can use a wet sponge with a little bit of soap. The cover cannot be washed, or tumble-dried since the coating (waterproof layer) will be damaged during these processes.
Since the fabric is made out of Acrylic it is very important you will never iron it or place it over an oven that is not completely cooled down. Wait at least 8 hours after firing before you place the cover over your Outdoor Oven.