Felge was painted by the previous owner –> How to remove paint?

Hi guys, the title says it already! I bought a Kawasaki ER-5 used 2-3 years ago and the previous owner was so witty to paint the front rim with a brush white. He left the rear wheel rim grey. That looks 1st correct *** and it was not evenly made and there are bristles in the white color. Ka what the master thought there. Is there a way to get the paint off without damaging the rim? What aggr esives like brake cleaners or such things? Is it absolutely necessary to get rid of it, because it looks corrosive. With two more photos, once the front wheel rim (pained) and the rear wheel rim that is still normal. Does this have a protective varnish or so on top of it that I could take off when removing the paint? If I have to do this with chemistry and that might attack the tires, that would be really bad, as I (as you can see on the tyre profile) get completely new tires on Wednesday anyway. B in grateful for every tip!