If your glass cooking dishes have acquired a grimy patina of burnt and baked-on food residue, use Alka-Seltzer to blast them clean. Fill the sink with water, and drop in five or six tablets. Place all your gunked-up glass cookware in the sink, and let it soak for about an hour. Lightly scrub and rinse with plain water—the burnt-on bits should easily flake off. Note: For extra cleaning power on tough stains, add a cup of vinegar to the soaking water.