To rid yellowing, mix together 1 cup bleach, 1 cup baking soda, and 4 cups of warm water. Apply with a sponge and let sit for 10 minutes. Rinse and dry thoroughly.
Try this effective overnight oven cleaner. Set the oven to "warm" for 20 minutes, then turn off. Put a small dish of ammonia on the top shelf, a large pan of boiling water on the bottom shelf, and close the oven door. The next morning, air out the oven and wash off even hard, baked-on grease with ease.
Pour in a cup of salt and a cup of baking soda followed by a kettle of boiling water.
Whiten the porcelain sink by spreading paper towels on the bottom and saturating with bleach. Let sit for an hour or so. Clean the fixture with rubbing alcohol or vinegar on a sponge.
Boil metal heads in 1 cup of vinegar and a quart of water for 15 minutes. For plastic, soak it in equal parts vinegar and hot water for 1 hour.
Place an open can filled with kitty litter in the area overnight.
Try shaving cream (try on an inconspicuous area first).
Fill a spray bottle with vinegar and 3 tablespoons of salt. Spray on the discolored copper and let stand. Rinse off.
Heel marks surrender quickly to turpentine on a rag, or you can just try an ordinary pencil eraser.
Try club soda for quick clean-ups of fresh stains. Blot instead of rub to avoid spreading the stain.