Dingy under the wheels shine

[BfisherNC]

I have a Mercedes with factory wheels - gets cleaned every weekend (Blackfire products). I've noticed my wheels have developed a bit of a "dinginess" under the surface. When they are clean, they shine as expected - but when I inspect closer, I can see some dirt (which appears to be) under the finish (see image).

I have tried a few wheel cleaner products, Clay, Flittz metal polish, and Meguiars Ultimate Compound to clean them... no improvement.

Any recommendations? Thanks!

[ArkayoDeetayo]

clay, ironx, cleanser

[CharlieU]

I don't know about the cleanser idea. Periodically I use a product called Royal Brown that just eats brake dust. Works great on my Mercedes wheels when I see the same thing happening as you are. I follow up with clay and seal with a polymer. Follow on maintenance is just washing with car soap and applying more polymer when waxing the rest of my car.

[BfisherNC]

Thanks for the notes guys - looks like I have a few more products to try