I've used the anti-freeze method on several occassons. I just use it straight. remove any rubber parts and gaskets. Set it up out side and let it cook overnight on low. Put the lid on and put something on top to keep animals out of it. Next day, just brush any remaining gunk off with a tooth brush. Rinse it with water, then dry thoroughly. After the Antifreeze cools, just pour it back into the original jug and save it for your next use. You won't need to dispose of it for years.

Brad