i use them on everything but my paint! they are the best!

 

I bought the ones for "Tires and Wheels". They appear to be the same as regular Magic Erasers. Wore out just as quickly too.
I like 'em, they work great. It's just that I didn't see a difference in the ones specifically for "Tires and Wheels".

 

Simple Green and the Magic Eraser are great for clean rims and tires. I use both on the engine as well. Just don't ever use those damn things on painted items.