If you have headlights that need to be cleaned, there are a few things you can do. The first is to use WD40. WD40 is a household cleaner that can be used to clean many things. It can be used on surfaces such as cars, boats, and even your hands. When using WD40, make sure to use enough of it to cover the entire surface that needs cleaning. Be sure to wait until the cleaner has completely dried before using it again.