Even my stockies fog up every now and then, when theyve been sitting in the heat. You could try airing it out by loosening off your headligt bulbs a bit, but i wouldnt really recommend it. Just drill a hole a few mm in diameter in an inconspicuous place (like a corner or something) and put some clear silicone around the edges should solve the problem. You are probably better off taking them apart and cleaning them though as it will leave the inside of your light slightly dirty if you dont.