The ideal product for heavily soiled wheels. High braking speeds, soft brake pads and infrequent cleaning can all contribute to filthy wheels. P21S Gel Wheel Cleaner will easily clean even the dirtiest wheels. The gel formula conveniently clings to vertical surfaces. Simply spray on, allow to stand for up to two hours and then rinse off with a sharp jet of water. Stubborn spots may need to be wiped with a sponge.