I don't generally like to wait around so, I usually just spray both racks and drip-pan in the sink with oven cleaner, wait about 15 minutes and just spray off with hot water in the sink. Anything that doesn't spray off (almost 99% will spray off) will come off easy with a nylon brush as it's now soft. Yeah, I know a little caustic, but I don't like to scrub. I once sliced my finger on one of the vents in the V-pan attempting to clean with a dish cloth...not again!
JD