Through my 20's my vehicles were spotless inside and out. I bought a used Toyota truck for $6900 (book value $7500) and drove it for 3 years putting 40,000 miles on it. I wrecked the truck and it was totaled by the insurance company. They gave me $8900 (book value about $6000 by then) along with a list of extra value. Engine extra clean, drivetrain extra clean, paint extra clean, carpets, interior, chassis, wheels, tires, glass, etc.
I had a car that I literally changed the color of from hand polishing and waxing twice a year.
Since I've been married, bought a house, had kids, and now have 2 cars, there just isn't time to play around washing cars. Last year I bought a black VW Jetta and started to do my detailing work on the cars again.
Winter runs havoc on the cars though, and since it has rained every day but 4 now since March, I haven't had a chance to do any detail work on the cars. I have too much other stuff that needs done on the house.
Cleaning cars won't happen this week either. Rain starting tomorrow through the end of the forecast.