Cleaning cooking trays? Whats the best way to maintain a cooking tray from getting rust...

Whats the best way to maintain a cooking tray from getting rust and burn on grease?

what would you clean it beside?
Answers:    I clean mine beside brillo pads.:)
Before you cook on it, place a sheet of foil on it, that path you can just throw it out and do a spur-of-the-moment clean. If it already have grease on it, spray 409 on it and let it sit for an hour or so. Or if it is not nonstick, use a brillo wad. Then use foil from here on out.