Ozzie gets homecooked food so his face is frequently a mess after a meal. If I don't see that he has something on him, he will jump in his bed, on the sofa, on the floor (now the throw rug since the carpet's gone) and rub it clean.
One time, he came out of the kitchen and I caught a glimpse of him and saw a chunk of cottage cheese by his mouth. Before I could even get to him -- much less get a rag -- Toby the Kitten came up to him, sniffed his face AND ATE THE COTTAGE CHEESE!
So now I tell Ozzie when his face is crummy that we need to call Toby.
