Any idea on how to do this? I read the write up for plastic head lights, but I don't know if it can be applied to fogs. I got 1 new fog light...and it's 2x brighter than my crustified older fog light...no idea how to clean/buff off whatever is there.

 

If you're cleaning your 98's lenses, they should be plastic. Aside from that, I would think any method that is safe for plastic is definitely safe for glass. Use a buffing wheel with some plastic cleaning compound.

 

I used some light rubbing compound and it work pretty good.

 

JC Whitney sells a glass polishing kit. Comes with glass abrasive compound, small buffing wheel and instructions. Works will on windshield scratches and will probably be perfect to polish a glass fog light lense back to like new condition.