Are the swirls on the inside or the outside of the lens? Maybe somebody tried to sand them down but didn't have high grit sandpaper and polishing compound.
You can use LEDs but you gotta make sure they are the can bus type or whatever they are called otherwise your blinkers will blink faster than a rabbit does you know what. Imo LEDs don't improve your lights at all. But you can order them from the usual scumbags AliExpress, eBay, wish, geek...
If I remember correctly Brabus models have an led 3rd brake light. You can order that and it's an easy swap.
Please for the love of anything don't put LEDs in your headlights unless you actually paint your housing properly. Otherwise you're just blinding every driver you encounter.
2008 Passion new owner. My fog light lenses have "swirls" in them. They shine good and bright but looks like someone just started mixing paint with a stick? Is that normal? Have they gotton too hot at some time or other? Are the lenses just getting wore out? Also...Is it ok to use LED bulbs in the brakelight/taillight assembly and maybe turn signal too. Just want the little car to be seen as well as possible and safe for the wife to drive. Anyone have part numbers for LED bulbs for it or know where I can get them? Also maybe LED for third brakelight?