3m finess-it compound works well, takes a few minutes, but I didnt sand then first, only polish. I'm using cheapy pads that halfords had reduced to 50p each, they work.
Without UV protection from clearcoat, they will need it again by October.
I bought a turtlewax kit, not expensive.
Came with restoration compound, protection treatment and the polishing pads.
Wasn't expensive and did a really good job on some range rover headlights which will be about the worst you will get!
I bought a small bottle of cerium oxide compound and some feet pads for cleaning the ceramic glass in the door of my log burner. It worked well for that but it worked fantastically for clearing g the opaque gauge lens on my argon regulator. I reckon it would make short work of doing a headlight lens.
I used wet sanded a set of 306 lenses, working up the grades to p2000 then finished with farecla g3 and g10 compound. Didn't use any wax/protection and they are still ok.
I give my headlights an occasional polish with whichever product I'm using on the car paintwork. Never needed to use one of the repair polishing kits on any of our cars.
Then started thinking about my degraded headlights.
I took my sanding pads, cordless drill and 3m polish out to car. I didnt really want the effort of dragging the compressor and my 1k clearcoat cans seem to have leaked, so that means any sanding would need to be done in 2k and potentially two days without driving for it to fully harden,hmm, good reason I thought to just try the polish.
Very happy with results. Theres an area on the nearside that looks like the dirt has overheated the plastic and...
Last week I got an mot advisory for weak offside beam so they need doing again.
I used one of the kits for the headlights on my car and got mediocre results for a lot of effort.
Did the headlights on my daughter's car with Farelca G3 and a foam pad on a rotary polisher and they came up sparkling for almost zero effort. (Used the remnants of the "protective lacquer" from my kit on them afterwards just in case):