When Geoff Garrett sees a mini-van pull up to Suds Brothers Car Wash in Grass Valley, he knows the staff has their work cut out for them. Those stubborn little Cheerios get stuck down between the seats, and the greasy hand prints on the rear windows require a few extra swipes. But Garrett and the workers take it all in stride ­— a dirty car just means another chance to prove to a customer that the newest car wash in town is worth coming back to. Garrett, along with co-owners Ken Meyers and Larry Green, opened Suds Brothers Car Wash …