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I agree with Java on this. Go EASY!
Lacquer thinner with a blue Scott Shop Towel is one of my “go too’s“ for cleaning inner wheel barrels... but the clear will get soft if you work an area too long!
It’s a common mis conception that (Porsche) wheels and others are “powder coated” and impervious to chemicals.
With the Porsche stuff (and other OEM wheels) there is a thick off white base primer/coating and then the outer face of the wheel is painted silver and clear coated. The inner barrel gets some silver “overspray”.
Using manual brushing/scraping with a wheel cleaner like P21-S or the Griot’s Garage wheel cleaners as suggested will work to safely remove the build up. Yes it’s time consuming, but it will work.
You can use the thinner after the crusty stuff is removed. Thinner works best on road tar...not as well on the embedded brake dust.
Oven cleaner is extreme and honestly a good way to ruin your wheels.
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