Welcome back!
Are they scratched or are the bugs embedded on the lights?
If they are scratched, you can try using (IIRC) 1200 grit sandpaper and plastic polish, then wax.
If it's just bugs embedded, try: bug & tar remover, WD40, Meguiar's Cleaner Wax.
Also try a
search for "clean headlight" under Aesthetic.
Good luck.