I have read several posts and seen several videos where people use Iron removers on both paint and wheels, and most of them with quite a bit of success. Others recommend Iron remover on paint and a dedicated wheel cleaner. When i read up on some of the wheel cleaners, like Sonax for example, it says it goes on green and then turns purple/red like an Iron remover. On the McKee's Iron Remover reviews it's used on both paint and wheels and seems to work well. The 3D Brake Dust remover seems to get marketed as a product that will kill 2 stones with 1 product. My question is why use 2 separate products? If an Iron remover will do the job on both...why buy a separate wheel cleaner?