I don't have any favorite brand of wash. . . but I can say I've taken my car through an automated car wash 3 times in the last 13 years (out of town, & no supplies). I (nearly) always hand wash & towel dry my car. And rarely go more than 1 month between washes.With more frequent washing taking place in the summer months . . .because the last thing any paint needs is the phoenix heat baking in any debris. + oddly enough I've gotten really good results with turtle wax's F21 line, the protection seems to last well