Vuplex plastic cleaner.

This product is advertised to clean clear plastic sheets and films. They claim it can fill scuffing and make scuffed plastic look clear again.

Scuffed and dirty clear plastic sounds a lot like my sails so I bought some at Bunnings and had a go.

from my post in the general forums:
I tried the Vuplex today on a well scuffed and clouded 2018 5.4m KA Koncept. This one travelled many thousands of KM in '18-'19, rattling along in my trailer, and doing a lot of hours on the very saline Lake George, so it is a worthy trial sail.

First i did the main boom level panel on both sides. I hung it up to try to compare that panel with the one below, but it was hard to get a good view while holding it. I asked my wife to come and have a look and tell me if there was any difference in the two panels. She was immediatly adamant that it was a Huge difference!

OK, so I did the rest of the clear panels and hung it up to inspect.

It's is most definitly clearer than before. But the serious scuffing, for instance where the sail rubs on my outhaul attachment on the boom, are still quite visible. They may be a bit better but it's hard to tell. But the overall clarity of the panels is definitly a big improvement.

I am due to recieve some brand new sails very soon, so I will treat them with this to see if they shed water better and stay cleaner and clearer for longer.

Oh, and I tried it on Motorcycle helmet visor and it come up like brand new. Just that made it worth the $$.

It's hard to tell from pictures and I dont have 'before' examples, but for what it's worth, this is the after:

Bad scuffing spots still very evident but may be slightly better.

The clear panels definitly came up cleaner and clearer

All this measures are temporary, to no avail which won't satisfy a true windsurfing soul. In no time you will get the irreristable urge to replace the monofilm panels, or... even worse buying a new sail,ha-ha. So money all the way down. At least this is how things work with me..