Best way to clean scratched headlights on car. Looks like previous owner tried a disc sander and has left clearly visible marks.. Plastic headlight on 2014 Volkswagen Amarok - thanks

Are your headlights beams too high? too low? Then bear with me and maybe I can help
Horizontal headlight adjustment is easy. See the screw on the inside top of each light? turn the screw left and your headlight beam goes outward; turn the screw right and the beam goes inward, (toward the center.)
Okay now Vertical adjustment is a little more involved. Start by removing the corner lens; take out the screw on top of the headlight and pull the corner lens forward. This will allow you to access two 10mm bolts holding the headlights in on the sides.
Remove those, along with one 10mm nut on the backside of the headlight assembly (near where your bulbs plug in). Remove your headlight bulbs carefully - I usually put a paper towel around them to protect them from dirt and oil. Now the only thing holding your light housings on are the horizontal adjustment
screws. Just slide the screws out from the lens, and then remove the headlight from the car.
If you look at your headlights now, there is another screw that looks just like the horizontal adjustment screw.
In order to adjust this, you need to remove the 10mm bolt labeled "A".
Now slide the plastic headlight base off of that bolt. The whole plastic base will now be free to swivel on the adjustment screw. What you need to do now is to turn the plastic base around the screw; if you turn it clockwise or right, it will lower your headlight beam when reinstalled. If you turn it left, it will raise the beams.
I ended up only turning each side lower by one revolution. You shouldn't need more than one or two turns. It also becomes hard to slide the housing back over the "A" bolt after two turns. If
in doubt about whether the beams will be raised or lowered, on the final pic you can see the clean area of the bolt on the left side. if you lengthen this side, it causes the beam to go down.
Its really easier to understand as you are doing it, if this does not seem clear. Just use some common sense and you'll see what I mean.
Installation is the reverse of removal.

they are NOT detachable,if they are showing signs of flaking(streakes)you will have to replace them.....

Your Camry doesnt have individual lenses but a headlight assembly. You will have to purchase the WHOLE assembly to replace just the plastic covers (what youa re calling lenses.) If its a lite scratching and haze you can get a lens polishing kit from 3M at your local part store. Follow the instructions to remove haze and light scratches yourself. If you do decide to replace the headlight assembly try Rockauto.com or partsgeek.com for best prices

Novus products worked for me. There are three strengths. No. 1 is a general
spray cleaner. No. 2 is a fine scratch remover that requires some elbow grease.
I find rinsing it as I work it in helps speed up the process. The yellowing and
small scratches are caused by ozone and sand blowing in the air. This product
won't make it factory new but it will give a much better cleaning than any other
product I've found. I've saved many friend's the expense of changing their
headlights.
Don't use windex or dishsoap on headlight plastic. They have ammonia in them
and causes microsopic pitting and fractures in clear plastic.
I bought my Novus products on line, saved gas running around trying to find it.

You don't have to, they are scratched on the outside.

If they are just surface scratches on the plastic lens, you can use any paint scratch removing cream or liquid as directed on the can or bottle. But if the scratches are deep and go beyond the surface there is nothing you can do. Try using acetone for slightly deeper scratches but test it on an obscure spot before trying on the middle. Hope that helps. God bless!

get a lens refinishing kit on ebay or at parts store

You can use a very fine steel wool to remove the film. You dont have to press hard to remove it. Pressing hard may result in scratched lenses, however if there is a film, you can remove it useing fine steel wool. There are 4 (i think) grades of steel wool, 0, 00, 000, and 0000. The 0000 is the finest grade of steel wool. Many carpenters use this when wood working to help with the wood finish. It helps polish the stains.

this is a permanent job!