Dirty headlights hi, could anyone let me know if their is a way of cleaning the inside of the headlight glass on a ford focus, they are dull and turning slightly yellow and wondered if they could be restored to their former state, does the lens detach from the light unit in anyway or something similiar, as much info as poss would be greatly appreciated on this subject, many thanks in advance to everyone on here what a great job you all do, dave.

Depending on the model, recent or latest model has built in
adjuster for headlight. Otherwise, if your car don't have, then
you have to open the front hood and locate one or two screw
bolts besides each headlight. If you only see one (1) then
that can adjust up and down only focus. If two (2) screw
bolts, one screw bolt can adjust up and down (vertical) focus
and the other screw bolt can adjust left or right (horizontal)
focus.

This is a most unusual question as almost everyone knows how to clean one of the earlier glass headlights which like the later polycarbonate lens just needs washing with water and detergent and perhaps a brief polish with a glass cleaner or polish.

I therefore suspect your headlamp lenses are not dirty but have become scratched and sandblasted and in the case of the polycarbonate ones, discoloured.

If this is the case then the only solution is replacement though polycarbonate lenses can be improved and given a longer service life if not too seriously discoloured by polishing with an abrasive compound - the sort of cutting compound used on dull and rough auto paintwork and then finished with a finer compound. It is extremely long and hard work by hand but the careful use of a polishing machine will shorten the task considerably.

I suggest you ask for help and/or advice at your local car sprayshop.

Go to junkyard and pull off 2 "new" ones, or drop the dough for new. Never heard of anyone ever cleaning out the inside of a headlight. I would say it is impossible unless you are a castmember from "Honey, I shrunk the kids!". However, I would say it is even more impossible to get the inside of one dirty as they are sealed and the only hole in one is where the bulb/socket assembly plugs in.

if you mean the actual headlight glass they dont come off as are sealed beam units and probably not dirty they are blemished inside by u/v light from use over the years change the whole head light search online for a good deal cheaper than dealers etc

Sorry. not possible on your model car

Almost certainly an earth problem. Bad or dirty connection to a part of the body of the car. Check for any corrosion on light fitting area, clean if dirty. Check wiring lead connections. Clean if corroded. Try spraying with WD40 or similar as this will prevent any further corrosion and ensure better earthing.

Also Check wattage rating and colour type on the globe you have put in. You should really replace both headlight globes at the same time to ensure similar quality of light is produced assuming all other factors are good.

Good luck with it, hope this helps.

These headlamp housings are sealed and not meant to come apart. There is a headlamp polishing kit that is sold in most auto parts stores that is used with a low speed drill to polish the fog and glaze out of the plastic lens using 3 or 4 steps of fine gritted paper with a polishing compound to finish the job. If the housing has water in it or is very dirty inside there isn't a whole lot you can do to get that out of there short of replacing it. Hope this helps a bit!

take the headlight units out,wash iside with soap and water let them dry and to give shine on the out side there is a product that restores the shine to dull head lights.its sold in autozone

no you can't as its a sealed unit.