thinks... how easy is it to get to the inside of the lens cover? You can buy stuff to prevent/reduce condensation forming (sold for bike visors etc), has anyone tried using that?
Haven't tried it myself but I do need to get behind lens cover at some point to remove dead flies! and will drill the back covers while i'm at it.
Binz
You can't open the headlight units, some people have tried putting them in an oven to help get them apart but I don't think they had much success. As said above, drill holes, or use silica gell packs. It's just something thats always going to be there regardless of what is tried to remedy it.
.G.