Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: The mother of all wheel cleaning products!
Review: The best wheel cleaning gel! When stubborn brake dust will NOT come off, let this stuff site for a few hours, gently agitating every once in a while. Then wash off, you may need to use your nail to help scrape off remaining bits, but this stuff works wonders.
