If you don't mind spending a little bit more money for a slightly better product I would suggest trying P21S Wheel Cleaners. This product works well and is very safe on the finish of the wheels.

You can order a 16.9 oz bottle and sponge for about $15.00 and 33.8 oz refill bottles for about $20.00.



One really good tip I found on the STi is that it really helps to wax the wheels to help make the following cleanings much easier and quicker.