Baby crested geckos can handle getting their feet cleaned. Trust me--I've cleaned many a foot. It is much better to get stuck food off of toes and feet than to risk lost toes. In nature they aren't in a confined space walking through CGD, so it's a bit different than just getting dirty. There are certain species of geckos that are much more delicate and the same principles do not apply, but with cresteds it's pretty straightforward--if food gets caked on their toes, you soak if necessary and gently remove the stuck food.