Wheel cleaner discolored my calipers?
 

I gave my car a deep clean last weekend, and cleaned the wheels using Adam's wheel cleaner.

The wheel cleaner worked great on the wheels as advertised, but after I had finished brushing the wheels and sprayed them off, I noticed that the wheel cleaner had left ugly dark splotches on my silver brake calipers. I have not been able to get these marks off with water or soap. I have yet to try brake cleaner or alcohol, but would need to take off the wheels to get better access to them. What are these spots and how do I remove them? Was the stock silver caliper paint damaged by the wheel cleaner? I thought it was specifically made to avoid that. Is the only fix to paint them? Pics attached.

https://imgur.com/RvBO5Xe

https://imgur.com/J7Lo3ZB

They look zinc plated, not painted.

Most likely brake dust was sitting on them etching the finish and you didn't notice the discoloration until after they were cleaned. You could always contact Adam's and see what they say. If it is gentle enough to go on a wheel finish, it is likely fine for the calipers.