I was just sitting at the computer wondering about this. I have always cleaned the tires with Eagle One once a week and scrubbed them to get them clean. I was just wondering if this seemed overboard to anyone and if I should just be scrubbing them with a tire brush weekly and using the tire cleaner less often. Keep in mind, that a week for me consists of roughly 400 miles worth of brake dust and Dallas/Ft. Worth interstate debris. By the way, I already tried to search for the answer and couldn't find anything definitive.