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How can I clean my hand that's inside a cast?

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So I broke my left wrist and it'll be in a cast for like another month.. It's totally freaking me out that I can't wash that arm! I don't want to eat because I feel like the dirt from my arm is gonna get in my food, I can't sleep with my arm anywhere near my face and I just feel SO disgusting. I have mild germaphobia so that doesn't really help. So is there any way I can clean inside the cast??