This is true for most road soils but not so for brake dust. Whilst it is not so common for you guys to do, in the UK we are bombarded by people spraying bleeding wheel cleaners onto their wheels to try to show the most significant bleed. The laugh of it is that these are often people who insist that regular cleaning need only be done with shampoo when the wheels are properly sealed. The fact of it is that it is almost impossible to stop brake dust, at several hundred degrees, from becoming embedded in the surface. Whilst I appreciate not everyone can afford to do this, to keep your wheels genuinely clean, you really need a mild iron removing product used on a regular basis. We recommend the use of one of our products diluted down and the proof is plain for all to see - the sealed wheel which is only cleaned with shampoo will bleed significantly a couple of months in whilst the wheel which is routinely cleaned by the pH neutral bleeding cleaner (diluted) shows very little reaction to the full strength iron remover.
As I mentioned, the primary reason not to do this has to be financial since this sort of maintenance washing will be more or less as harmless as washing with regular shampoo.
