Yes,
I started washing cars in 1968 during the weekends and on summer vacations when in high school.
Thereafter, I taught myself to detail by reading literature from Germany on how to recondition vehicles. I then started a little detail shop in a one-car garage. I also have several years of experience doing reconditioning work in-house (retail and wholesale) in the evenings and during weekends for a new car dealer that sold Audi, Porsche, Lotus, Alfa Romeo and, LOL, AMC. During the week, I worked full-time in the detail shop for a new car dealership that sold Buick.
After that, I went to GM Training Center, Fisher Body School, through a dealer apprenticeship program for auto body repair and paint refinishing. I work at that trade for 4 years, also detailing at home on weekends.
After that, I eventually owned/operated a full-service wash with lube and detail shop. I also have several years of experience as a general manager for high volume washes with both detail shop and express detailing programs.