I try to do mine every weekend,ultra paranoid about my monza exhaust! Cleaning the wheels of tar and brake dust takes longer than washing the rest of the car! In the summer I'm going to clay them. Suprised at the amount of brake dust it makes to be honest! I don't even use the brakes very hard. At least it's got warmer here,few weeks ago the water was freezing on the roof straight from the hose,my hands were numb!