I use the sprinkler and very hot water, right after using it, like Bilby said. Everything comes off, but I still toss it in the dishwasher.
I like those single sized flat cheese graters as opposed to the four-sides ones. Mine came in a 3-pack at wally world. It's very easy to get at both sides when rinsing, they don't take up as much room in the drawer because you can store them flat against the side and out of the way, and if one is in the dishwasher another size will usually work.