Yeah, $20 thats too good of a deal. You can do my car anyday and everyday for $20, Oh wait my car is in my garage all banged up from the accident still. Yeah 20,30, 40 bucks is toooooo cheap. I used to do cars for 75 bucks which included: Wash, polish, wax, power wash the engine, the inside, tires, and door jams, and the rest of the trim. After a while I realize the $75 is too low of a price, thats just me. But I tell you to do it about the same price or even a little more. Good Luck w/ the little business.
-Bryan