anyone ever use Eagle One A2Z wheel cleaner? (Xpost frm detailing forum)

[hogx1]

I picked up the aerosol A2Z wheel cleaner, and wanted to try it out before i tried it on my car, so i used them on my moms SLK winter wheels, they are 3 yrs. old and never been washed, they were stained yellow from the brake dust and had dust as thick as a quarter in spots, i sprayed this stuff on let it sit washed it off, sprayed it on again, and used a sponge/brush to agitate it, and the wheels looked brand new. as far as i can see great stuff, is there a downfall im not seeing, they have HRE wheels on the label so i figured they were good hahah (i posted this in the detailing forum but no answer)