I use Bilberry wheel cleaner when necessary as that doesn't damage the rims, and then seal with Poorboys wheel sealer. Allegedly as long as a regime of washing with shampoo and resealing with the Poorboys is maintained then it should not be necessary to use wheel cleaner again.
The problem with the IS-F wheels is the brake dust apparently. The brake pads certainly have a high ferrous content which can be seen as a rusty deposit on the wheels after wet weather. I sorted the dusting on the 250 by using the OEM ceramic based front brake pads so I'm picking up a set of Hawk ceramic pads for the IS-F next week while I'm in the U.S.
Hey, Ive got an IS-F and was wandering if the Hawk ceramics are any good - im getting the rust on my rims and so was thinking about getting the Hawks. Thanks