Get Whiter Nails! 1. Buff the nail to get any surface stains off. 2. Combine 1/2 cup of hot water, 4 tablespoons of baking soda (stir that until it mostly dissolves – it won’t dissolve all the way) and 2 tablespoons of peroxide. 3. Allow your nails to soak for about a minute each hand. (Or more if you’d like, but a minute is really all you’ll need!) 4. Show off your beautiful nails!