Wash the headlight with soap and water
Dry the headlight completely
Apply a small amount of non-gel toothpaste to a soft cloth
Rub the toothpaste onto the headlight in circular motions
Keep rubbing for several minutes
Add a little water if the toothpaste dries out
Wipe off the toothpaste with a clean damp cloth
Repeat if needed until the headlight looks clearer
Rinse the headlight with clean water
Dry the headlight with a microfiber cloth
Apply a UV protectant or car wax to help slow future clouding