I have the same problem. I see you are in Leesville, LA. I'm in Lake Charles, LA. Maybe it's caused by the humidity here. I'd like the answer to this one myself.
I had this problem and couldn't stand it any longer. I cleaned the inside of the lens and the reflectors with some medical swabs ie. large one sided q-tips dipped in alcohol. Was able to bend them enough to get all the inside clean and shiny! It did take some time and effort but was worth it! I have since changed out the bulbs to PIAA X-treme White! Have not had a problem since I ride in a very humid area as well and have logged many miles in the rain with no more fogging!!! Just my 2 cents!!