Now this is my kind of tire care! This can be used on dry or wet tires. All you do is spray it on, you do not have to wipe it off or do any scrubbing. Richard Petty even endorses this product, it cleans the tires, makes them shine and even protects them. It comes in several size containers from a pump to an aerosol. After washing your vehicle you simply spray this on, it dissolves all of the dirt, dust and grime. It will penetrate the outer wall and bond to the surface to protect not only the rich color but helps prevent cracking. If you spray the STP onto your tires while in a concrete drive you will need to rinse the excess foam from the concrete to prevent it from staining. This product contains no CFC'c which is what depletes the ozone layer. This product is fairly inexpensive and can be found in any automotive store, I purchase mine at Auto Zone.