Have foggy headlights? The solution is in your very own bathroom. Toothpaste isn’t just a useful for brushing your teeth. You can use toothpaste to clean foggy headlights. You simply apply toothpaste to the plastic lens cover of your headlights and with a cloth wipe the fog away. Be sure to rinse out your headlights with water and dry them down to remove any toothpaste residue.