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When hard water evaporates it leaves behind tiny white and green particles that look like chalk dust. This dust can get caked onto surfaces that you will be unable to simply wipe off. If you have these mineral deposits on your headlights, you will have to remove them as soon as possible to ensure that your headlights are bright. Mineral deposits also act as an abrasive powder and they can etch glass or hard plastic over time.
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Mix 1 cup distilled white vinegar with 1 tbsp. lemon juice.
Dip a clean cloth into the mixture and rub it over the mineral deposits on the headlight.
Lay the soaking cloth over the headlights if the stain does not come off easily. This will allow the vinegar to penetrate the mineral deposits.
Remove the cloth and gently scrub away the mineral deposits with a toothbrush.
Rinse the headlight with clear water and dry it completely.