I struggle to find a car wash.

Anyone?

most tesco's and carfoures have carwashes in their carparks, wash avenue to a good job, they are on petchburi somewhere between the prom pong and tong lor turnoffs

Best one is WAC behind carrefour on soi 26 http://www.waccardetailing.com/home_eng.html

There are car washes everywhere, almost not possible to miss them. On the smaller streets that is. You find them by looking for smaller companies with a small yard where they park a couple to several cars that they wash and clean. Price is approx 120 to 150 bath in Bangkok. Are they as good as the one at the department stores that change 300 bath? No, some are not even OK, others are clearly OK for the price. Dig around until you find a decent one or pay double or more than double at the other recommended places above

There is a place run by a French guy (I think) on Suk 23 around the corner from Narcissus.