I bought Iron X a while back because I was looking for a good product to clean wheels. The wheels on my Alpina are in desperate need of deep cleaning to remove caked on brake dust. I've tried a bunch of other cleaning products, but nothing has worked so far. Somewhat unfortunately, I haven't tested the Iron X on the Alpina wheels for this review, but I can follow up when I do. Price: It's expensive. I was hesitant to buy it because of the price, but it seems like it's worth it. Smell: Smells terrible!!! Someone in another review compared it to a sewage plant. It smells bad, but not quite that bad. Result: It works! I didn't get pictures of the worst wheel I cleaned, but it worked so well on that wheel I decided to do the review after. I followed the directions and cleaned the wheels first using soapy water. Pic of the two cleaning products: Wheel before it was cleaned. I'd recommend removing wheels from the car if you are going to use the Iron X. I read some reviews where people didn't and they mentioned their brakes didn't work as well for a while after. I guess that would have to do with the stuff getting on the brake disc. After a wash and the Iron X applied. I took the pic quickly after applying the Iron X, but you can see that it has already started changing colour. After I let it sit for a bit I used a sponge to work it in and you can see contaminated locations coming clean that didn't clean with just the soap and water. I should also mention that with soap and water I used a scrub brush to really get all the crap off before applying Iron X. And the end result! There's still some tar spots left, but I'm definitely happy with the results. Alpina wheels will be the real test.