Yellowed plastic is a common problem that can make your belongings look old and dingy. Fortunately, there are a few simple ways to whiten yellowed plastic and restore it to its original color.
One of the most effective ways to whiten yellowed plastic is to use a mixture of baking soda and hydrogen peroxide. To do this, simply combine equal parts baking soda and hydrogen peroxide in a bowl and mix until a paste forms. Apply the paste to the yellowed plastic and let it sit for several hours or overnight. Rinse the paste off with water and dry the plastic thoroughly.