Bath time for Potato

Potato the hamster is having a nice time investigating our belongings, while we are cleaning his cage. Hey hamster, be careful of the scissors ok. 

Then, he got a light dousing of shampoo, which he hates. We try not to bathe him, since he dislikes being wet, but sometimes, he smells terrible. The problem is, he has decided to use his bathing sand pit as a toilet instead, though he still rolls in it! Why do animals get such silly ideas into their heads?