polish up old windscreen ??

[jerry]

my 750ss windscreen needs a good clean and polish whats thge best method ,, at work we used to use liquid brasso and a soft cloth to get scratches out of expensive sub sea lenses would that be ok on motorcycle ????or other ideas ???

[Nickj]

Originally Posted by jerry

my 750ss windscreen needs a good clean and polish whats thge best method ,, at work we used to use liquid brasso and a soft cloth to get scratches out of expensive sub sea lenses would that be ok on motorcycle ????or other ideas ???

Expensive lenses might well have hardened surfaces so something a bit abrasive would be a good bet. Possibly smoothing out edges also reduces stress but unless you're very very deep probably makes no difference I'd imagine other than to the image quality.
Polycarbonate screens on bikes won't have any significant surface hardening, they'd keep snapping if they did.
I'd treat it the same as a visor ...
Warm soft soapy water, spray or pour onto one side and then wipe gently with a microfibre cloth to remove crud. By wipe I mean like sweeping NO circular scrubbing as any fine grit just marks the surface. Wash off with clean water.
Repeat on the other side and if there's still grub repeat.
Blot any water on the surfaces with a chammy and leave it to dry.

Else scrub it with brasso and then repeat with finer and finer grade abrasives to remove the scratches the brasso put into it. Hours later it will be clear again.

[Mr Gazza]

They do say that toothpaste works on faded and scratched plastic headlamps, but I've never tried it.
A Cortina-E fanatic once told me he polished his chrome with Perspex polish.
E-ites are even dafter that you Jerry, but if you can find some Pespex polish it might be worth a shot?

[jerry]

the subsea lenses had a 15mm clear lexan end cap thats what got scratched by barnacles , structures etc the glass leanses were inside

[slob]

would paintwork rubbing compound work?

[Leamreject]

Originally Posted by slob

would paintwork rubbing compound work?

Yes, fine rubbing compound works. I used to polish screens on aircraft with scratch remover, worked well on both glass and polycarbonate

[Darren69]

T cut or something may work.

[Martin C]

Toothpaste should work. I’ve successfully used it on car headlamps in the past, and the car aftermarket uses an abrasive kit on many discoloured MOT-fail headlamps. Probably best to try it on a lower corner first.

[Dukedesmo]

As above, Brasso, T-cut & toothpaste all work on perspex, scratched CD/DVD, polycarbonate watch faces etc. use them in order of 'abrasiveness'.