Now, I know how to clean and maintain the tires in this picture...

But how do you clean full size car tires/wheels? I bought a set of wheels and tires for my car (a winter set) and they’re dirty. I have cleaned two of them very slowly and laboriously in my bathtub with a couple kitchen cleaners, including my usual for R/C car tires (Simple Green). While they both got the stuff off well with very little scrubbing (but a lot of work to move them around), I started wondering how Opponauts clean their dirty wheels/tires...