I tried Mr. Clean Magic Eraser DUO in the slots of my SVO Rims... worked really well....just wet the Magic Eraser with water like a spunge.... it says that when the white part of the Magic eraser is gone then its done for and get a new one.......... of course I rinsed the wheels off with garden hose after using the Magic Eraser and then wiped them with a white rag.
I believe I baught a 4 pack for less than $5.00. one lasted through cleaning all 4 wheels. also cleaned many of the black plastic pieces in the engine compartment. made the plastic look new.
just thought that I would share the love......