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How to clean a cast
Wipe the outside of the cast with a damp cloth.
If you happen to get your fiberglass cast dirty, try wiping off the dirt, food, or other mark with a damp cloth. Make sure the cloth is only damp and not too wet.
It should not leave any pools of wetness behind on your cast. No matter if you have a plaster or fiberglass cast, you should never get your cast wet or submerge it into water, even if you get it dirty.