Sonny would get a washing with a wet washcloth once in a great while.

Callie got a bath before coming in the house as she already had fleas. But she's 100% indoor cat so no need to worry about fleas or anything of the like now. She didn't even have an infestetation, we found 7 fleas, no eggs, and some flea poop. Must have been a recent accquisition as a stray.