Do your car’s headlights seem dull during your night time driving? They could be dirty. DON’T use glass cleaner on them! Experts say the ammonia and solvents in it may harm the lenses. Instead, use non-gel toothpaste. Using a soft cloth, rub a dollop on each headlight for about a minute. Then, wipe off with a clean rag. The paste is abrasive enough to remove the grime but won’t scratch the lenses.