You can't remove the lens on a TF. It is already sealed on.
Oooh! That makes it more difficult doesn't it! Maybe brush some sealant around the seam?
Possibly one of the honey-ish consistency superglues would provide a seal.
I have to reseal the taillights on both of my F's and am thinking I may give this a try.
I had some minor fogging in one headlight after the car sat in the rain for a month but it went away
after driving for a week or so. This may be one advantage to daytime running lights; they get more
heat than lights just run at night.