Expert: Mike Fulcher - 11/25/2008

Question
Have an unusual problem. Had a leaking headlight enclosure. Halogen bulb burned out every time splashed with the internally collected water. These bulbs when burning out give off a yellowish/white smoke that coats everything. Headlight enclosure now internally coated with this substance blocking the transmitted light. How can it be cleaned?

Answer
I've seen what you are talking about, but don't know what exactly it is off the top of my head.  I would try some calcium remover (dilute phosphoric or sulfonic acid) to see if this does anything.  It shouldn't hurt the headlight cover and is readily available.  Let me know if that helps.