Before he became Mr. Britney Spears, Kevin Federline had a career in the service industry -- workin' at the car wash ... car wash, yeah.
K-Fed worked the Red Carpet for two years -- Red Carpet Carwash in Fresno, CA, that is, where he started at the vacuums and worked his way up to customer service.
Manager Gilbert Alander says his now-famous former employee came to him one day and announced he would seek fame and fortune as a dancer -- so he moved to Beverly.
Another of Kevin's former co-workers confesses he and K-Fed would "get a little wild" and let their "hair down a little bit."
So, with his marriage under scrutiny, if it doesn't work out it clearly wouldn't be the first time K-Fed got the brush off.