If your tent needs cleaning, follow any cleaning instructions that may have been supplied by the manufacturer. Otherwise begin by picking a sunny day to set the tent up in the yard. Fill a bucket with warm soapy (non-detergent) water. Dip a soft sponge in this solution and gently wipe the tent down. Rinse with a sponge dipped in warm water to remove any soap, or use a garden hose to rinse it off. Allow the tent to dry thoroughly before packing for storage.