There is a method of cleaning the inside fog. You must use pure methanol 99.5% or higher purity which you can order on Amazon. The method requires several rinses and is tedious, for a full step by step just Google it. Methanol will not hurt polycarbonate or ABS plastic but it is extremely flammable (burns with an invisible flame) and toxic so PPE is highly recommended. Alot of members on the GTO forums have done this because new headlamps for GTO's if you can find them are $1000.00 each.