My two little sulcatas are always dirty from eating , dirt or their poop. I soak them almost everyday and as much as they let me I’ll use a tooth brush to try to clean them up but there’s always stuck debris on their behind and under shell. What is the best way in removing this? I’ve had a few people say to use a little bit of soap, but I’m not too comfortable with that. Any other advice on cleaning dirty butts and bellies?