oven cleaner-Cover bottom of oven with baking soda, then pour vinegar so it's all wet. Let sit around 20 minutes or so then wipe all of it out with damp cloth or sponge. Leave oven door open too. After drying you may see some white residue, wipe again.
Martha Stewart’s Tub Scrub -- Works great on glass shower doors too- no more soap residue! Martha Stewart's Tub Scrub--works better than any other cleaning product to get off hard water and soap residue