Yes they cloud if you allow direct sun into the lenses. This has happened with a pair of through beams (HL 2-32) that I have. Instead of waiting 2 months for them to have a vacation to Switzerland I decided to go at it myself. Take off the cover like you are going to change the batteries. Remove the 5 small phillips head screws and take off the cover with the battery tray. You can then remove the lens unit from the rest of the case (it will slide out) and easily clean it. With the lenses removed you can notice spots on the ABS plastic case has been melted from the sun, causing the clouding. I am very anxious to see the DBH racing sunsheild to help eliminate this chore. Time to clean 2 sets of HL 2-32 cells, 30 minutes. Do it yourself!!
PS I do remember trying to do this with an older HL 2-11 and found more sealed parts, not easy to clean.
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