Proximal phalanges fracture

My son and his buddy Jack flipped a Starbucks patio table over this morning. It landed on two of Finn's fingers. We went to the hospital and now he has this lovely contraption for 10-14 days. Tell me how I will keep an ace bandage type splint clean on a preschooler? Finn was very brave and only I cried in the examining room. He was fine when I mentioned we could go to Wild Oats afterwards and get some cookies (cookies of the devil). My poor boy.