In Irvine for a self-service car wash, this one is my favorite: All Hands Car Wash. The address is
3091 Edinger Ave
Tustin, CA 92780
You can get there by driving Irvine Center Dr North West until it changes to Edinger after the overpassing highway (Jamboree).
The equipment is good and so is the price. For $5 you get about 5-10 minutes of self-service, enough to get the dust of your car. I have had my brand new 2013 M3 E93 there twice now and I'm happy with the service they provide.
2013 M3 E93 Interlagos Blue, Silver Novillo