Normally I'm thinking about how to get my new, pre-owned LR3 dirty, but... it looks like the prior owner neglected the alloy wheels a bit. There is some brake dust "fused" on to the wheels in some spots. I started with the basics; Maguire's, Mothers, etc. spray on and rinse off, not even close. This isn't just a layer of dust, it's "fused" into some of the crevices. Next try was some of the highly touted P21S / S100. This is the stuff that the detailers use. A little better but doesn't appear to be the solution. I tested a very small area with Bar Keepers Friend which does the trick but involves alot of rubbing. Consequently, the brake residue has metal particles in it that scratch the wheel. So there it is... any ideas on a safe, mainly spray off approach? I am going to re-try the P21S after letting it sit for a few hours (safe according to them) then use a low setting power washer.