Okay, I need to know why the pan needs to be clean? How clean are people wanting it to be? I simply spray mine with a little cleaner and hose it off, which in my experience is far easier than foiling. Anything will instantly cut through the grease, and I can't see that the baked on hard stuff causes any problems...
I'm just not sure why the bowl need to be so clean, but the rest of the inside doesn't (except for the cooking grate obviously).