If it's condensation, remove the headlights or otherwise check to see if the assemblies have vent tubes and clear them if needed. Remove the bulbs without touching the glass (at this point you may want to clean the housings' insides with clean or distilled water and maybe ivory?, but use their SOAP, the soup might leave discoloration or oily residue. Ventilate the housings with a blowdryer or compressed air till COMPLETELY! dry (plan on a weekend where you can keep them indoors). Reinstall