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Re: primary reflector became dull with time.
The primary mirror is VERY delicate -- first surface mirror. Without a doubt you damaged it using auto polish. Mirror are cleaned very very gently using running water and alcohol-- and a tiny amount of dish soap... here is an article-- http://www.dvaa.org/ATM/MirrorCleaning.html
You can buy mirrors --- but they will be almost as expensive as a new telescope.
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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.
since its a 99 it has a sealed plastic headlamp assembly which means you cannot just replace the lens you have to replace the whole assembly a cheaper option if all that's wrong is they are dull is to polish them and headlight scratch remover/ polish kits are available at any auto parts store just follow the instructions
if you are talking about the lenses then you don't have to replace them, get some compound and polisher from a parts store, a few minute (hrs) with it and the lenses will look good as new, and a lot cheaper
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!
most of the time the dullness in the headlight assembly cannot be due to the lens dirt. this is due to poor reflector which has dulled out in the years of use. open the assembly remove the bulb and use good quality liquid cleaners to clean through the bulb opening. use a dry cloth to polish and finish off.
Firstly clean with DeBruce Polish to clarify area.
you may have to "re-grain" those finely scratched areas.
Blend or "scratch out" the misdirection scratch's with new
"controlled" scratching, useing a 3M scotch brite #7447 you get at
auto parts store (Nappa). Use medium very firm pressure.
-Re-clean with DeBruce Polish. Touch ups are now a breeze
DeBruce Polish is Odorless, Non-Toxic and non abrasive and perfect on
stainless steel, glass cook tops, polished granite marble and more.
DeBruce Polish is Odorless, Non-Toxic and Non Abrasive. DeBruce is
stainless steel, glass cook tops, polished granite marble and more. NO NEED TO REPLACE.
We buy DeBruce at debrucepolish.com.