Cheap and effective
first wipe lens with wet sponge of vinegar leave wet
then quickly old newspaper with Bicarbonate of soda
Or to polish out scratches CORN flour takes a wee while but is safe
on Aircraft screens and bubbles windows etc
Or weed killer Glysophate ( called round up and many other names)
Also gets rid of bathroom scale etc etc as well as weeds
Woops, forgot link, anyways do a search of Novus #2 cleaning polish on eBay
or the net. I use it to clean/polish all the clear plastic on my pinball
machines. Unless there are deep scratches it will do the job. Or you can
get a set of #1,#2,#3. Need some elbow grease and possibly several passes
but you'll have crystal clear lenses afterward. (assuming the plastic
itself hasn't become hazy internally) Great stuff.
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