Dirt and tires!!
I would say your APC of choice diluted to the recommended level for tires with a stiff gong brush for a 1st pass.
If that does not work, go slight stronger and try again with the brush.
both times, make sure to rinse it well, in addition to the surrounding areas.
If that does not work, go slight stronger and try again with the brush.
both times, make sure to rinse it well, in addition to the surrounding areas.
Simple Green has worked well for me. Spray on, agitate with a brush and spray off. Another good product is Meguiars Hot Rims all wheel cleaner. Make sure you follow the directions on the bottle because using the wrong Hot Rims cleaner can cause more issues in the future.





