I've used my IronX Soap (yeah, should've bought the other one

) on the S8's wheels. Now these are in *GREAT* shape, pretty much uhm... at least as good as showroom-new. Clean and smooth, zero rust-blooms, no issues at all.
I quit IronXing them after the fourth/fifth application still ran purple. "How often am I supposed to do this [stuff]?!?" and all that.
If I cared enough I'd try some "B" on 'em too and really make it an experiment, but this is one of those cases of "not looking for problems you don't know you have" that I'm always cautioning people against and I just want to get the job over with (nutty me, redoing stuff that's already virtually perfect

).