i clean my wheels often since i really dont drive it so its not caked on brake dust but there are some real hard to get spots any cleanner like spray on wash off that will be safe and good to use on powdercoated and cleared wheels

 

I use Meguiars wheel cleaner I think. It's in an orangey red bottle. It sprays on pretty foamy and takes off nearly all the dirt. If it's really caked on there, you gotta scrub a little.. but it does the job.

If your wheels were painted and cleared correctly I can't imagine it being a problem.

 

thanks i was looking for a good spray on cleaner i clean my wheels every week which is only about 150 to 200 miles so no caked on dirt ill have to give that a try