Hey, so here is what happened. One day i got a flat tire and needed to get home so i put some fix a flat in my tire and some got on my silver lip of my rims, now i thought i could just wash this off later cause i didnt have anything to wipe it off and was irritated at this point and just wanted to get home and the day after i washed my car after i got new tires and it stained my rim, its like a black area on the surface. it didnt stain it but it is just on there and will not come off. Do you have any suggestions on what could take this off so i can see that beautiful silver lip again? Thanks for any help.