Clean a toilet. Drop in two Alka-Seltzer tablets, wait twenty minutes, brush and flush. The citric acid and effervescent action clean vitreous china. Clean a vase. To remove a stain from the bottom of a glass vase or cruet, fill with water and drop in two Alka-Seltzer tablets. Polish jewelry. Drop two Alka-Seltzer tablets into a glass of water and immerse the jewelry for two minutes. Clean a thermos bottle. Fill the bottle with water, drop in four Alka-Seltzer tablets, and let soak for an hour (or longer, if necessary). Unclog a drain. Clear the sink drain by dropping three Alka-Seltzer tablets down the drain followed by a cup of Heinz White Vinegar. Wait a few minutes, then run the hot water.