Combining chemistry and economy, the best method with wheels will be:
1) Power hose without any product (removes anything loose - saves you wasting product to remove this)
2) Dedicated Wheel Cleaner (will get rid of some of the brake dust and much of the oily soiling - the latter can inhibit the effectiveness of bleeding cleaners)
3) Bleeding cleaner (use last, it means that your most expensive product is focused only on the stuff which simpler methods have failed to remove).
When you see someone spraying a bleeding product onto a wheel which has not had any pre-treatment, they either don't know what they are doing or they are doing it with their primary motivation being to see a massive bleed. In practice, all that bleeding is your product reacting with the brake dust. Once it bleeds, that product is used up, it can't react with anything else and there is more chance that you will exhaust the product which you have applied and thus require re-application. It is actually amazing how much will be removed simply with a water jet and how much more cost effective your clean can be by doing this.
Incidentally, with IX, apply dry or you won't get sufficient contact. Some of the other products are better designed for longer contact time.
