You have to pull the fog light out, then drill holes in the housing. I did this many years ago on mine and have not had a failure yet. I drilled 3 1/8" holes on top and 2 on the bottom near the back. theory is to allow moisture to drain from the bottom and steam to escape from the top.
No problems with my headlamps so no help there.
To remove the fog light housing you have the remove the adjustment screw first (phillips), then use a large flat screw driver to "pop" the housing out. To "pop" it out put the flat blade on the side of the housing near the pivot point and pry it out. (Basically you try to push the housing to one side while bending its "holder" to release the pins it pivots on)