O/S Front headlight keeps misting up??

[Brian23]

The O/S Front headlight keeps misting up. I took the bulbs out and let it dry out. Put them back a day later when dry. Made sure that the seal was in place on the cover. Checked that it was fitted correctly. 2 days later (today) there is condensation on the bottom half of the inside of the glass. Any ideas?
1999 SLK 230
Brian

 

[television]

It could be the seal on the glass

http://www.detali.ru/cat/oem_mb2.as...+++717.413&CT=F&cat=15U&SID=82&SGR=180&SGN=06