Water Condenses Inside Headlamp Housing

Water on the inside of the housing indicates a leak. The watrer seems to discolor the inside of the plastic and is nearly impossible to clean out completely. The water will eventually get on the bulbs and shatter them. I usually just replace the housings, they're not really expensive aftermarket. Here's some examples from Ebay. Itam numbers 8003465231 and 8003515111 are $80 total with shipping. They offer the pair for $99 including shipping(?). I got new housings from a local supplier for a 92 Tempo that I once owned for $30 each. For that price, why bother trying to clean, polish, and fix the leak in the old ones and still have lenses that will yellow again quickly.