Board Thread:General Nerf discussion/@comment-37595644-20190405233116/@comment-29595756-20190406034801

You can soak the parts that are yellowed in a 3% solution of hydrogen peroxide. All you do is put them in a clear container and leave them out in the direct sun for a few hours. Although, you may have mixed results on non-original white parts, so take extra care with yellow or blue because it's very easy to over do it. However, with white, you can just leave it in for the day.