You decide to let your nails go au naturale for a while to let them breathe, but after you remove your nail polish they look yellow! Oh, no! To remedy this rather than re-cover them with polish, fill a bowl with 1 cup of water. Add the juice from 1/2 fresh lemon. Soak for 5 minutes. The alpha-hydroxy acids in the juice will brighten your nails and banish stains. Repeat as necessary.