Take racks out of your oven. Turn on your self cleaning oven (if you don't have a self cleaning oven it's OK just clean the racks the same way), put Hot water into your bathtub (about 5 to 8 inches) & 1/2 to 3/4 cup of powdered laundry detergent, swish around, put in racks, let sit, by the time your oven is done (about 3 hours) your racks will be clean, wipe down (use fingernail to pop/peel off the really bad spots if there are any, maybe use a toothbrush to get into the tight spots and rinse, spray in your favorite tub cleaner and clean your tub as you normally would. Perfect! Three chores done in one (oven clean, racks clean and bathtub clean). Once you find out how easy it is to clean those nasty racks you will never have to scour, scrape, get steel fibers from SOS pads in your fingers or buy expensive cleaners that DON'T work again! LOL!