fans are the way to go. if you have an old 30/40mm computer fan and some time, make your own. took me about 30 mins to bodge mine togetherHave you tried spitting in your goggs and wipping the exsess off like you do in diving goggs or a bit or fairy liquid as i used that and i had no probs then i got new lenses and havent needed any thing since. Also try a turbo fan from dye.