Can someone tell me what this stuff on the rim of this wheel is?

I am interested in buying some used wheels, and the guy selling them says the only flaw they have is this stuff on the rim of one wheel. He doesn't know what it is, but he has tried rubbing it with a soapy sponge and it wouldn't come off. Anyone here know what this is and how to remove it? Thanks in advance.

 

It looks like the clear coat is peeling.

 

thats dog or cat piss ive seen it time and time again! if you get a mothers polish ball and polish it will come off but id use some eagle1 never dull. i made a bet with a friend that it would get it off and i won!

 

oxidation of the aluminum from where the clear coat cracked/peeled. takes a little work, but it comes off.

 

don't forget to reclear it.

 

What work is needed? Does it just need to be polished out and recleared, or what?

 

you're probably gonna have to sand the shit out of them and re-clear it, but if you do it right, the outcome will definitely be worth it!