Is cat wash where you just kind of lick yourself? Is a cat literally doing it? Did you intend to type car wash, instead? So many questions.
A "cat wash" is a Katzenwäsche.
Maybe you cannot translate it literally from German to English though.
It's the sort of washing where you only wash certain parts of your body, for example the armpits, head/hair and/or genital regions.
Maybe you can help me out what the correct English term is ?
We don't have a term for this because no respectable American would consider that to be sufficient hygiene. Sounds like a hooker living out of her car and giving herself a perfunctory rubdown with moist towelettes and perfume samples before she goes out on her next call.