It left drip mark looking etching in their black paint. They went from uniform gloss black to a varied drippy looking hazy finish. Oh well. Live and learn. Glad it wasn't the set of OEMs. And this was just overspray/drips from cleaning the tires themselves. When I was a kid I did my dad a "favor" and detailed his '91 Spirit. I used wheel cleaner on his OEM snowflakes. Ate the clear coat off of them. Haven't used wheel cleaner directly on wheels since.