Here's the link to the process and products I used. I'm not affiliated with Chemical Guys, I just use their stuff. Engine needs a clean too
https://www.youtube.com/watch?v=tSm8C3I6_w4
The cars outside 24/7 365 Fred. And hasn't had any tlc for a year or so..I've just done the lot, clayed, detailed, sealed, dipped rims again, headlights, cleaned leather seats, carpets interior and glass. Going to re-dye, clean the pram top and seal that in a couple of weeks.
How much would you want to do 2 front lights , bloke o brought mine off tried it and lights show he’s enthusiasm lol I’m tempted try it myself though ...