I used it all the time on my E1's, and still use it on my Dad's Sequoia wheels, those wonderful Buick Century POS, heck every wheel I've ever cleaned except the Crono Evo's. Also use it on every engine bay I've cleaned including the bare metal intake equipped Buick. Never had a problem with any of them but from now on I'll make sure everything gets a thorough rinse.
Perry, a friend recommended a Crest Spin Brush to clean wheels, think they'd work on those Century wheels that are such a PITA?