I currently use both and have never had a problem using the wheel cleaner, tire cleaner, or grape dressing. In fact, the grape dressing doesn't sling onto the car...the best product I have found so far. The tire cleaner comes diluted and has not caused any pitting on my rims (BMW 530i, G35 coupe, FX35, Acura TL). The tire cleaner does just that, cleans the dirt off of tires and preps the wheels for the grape dressing. I've been using all three products for about two years now.
Good luck,
TM
