cleaning plastic or fibre windows

[gambiancookie]

My river boat had all the windows changed to plastic or fibre, they have gone hazy not yellow because of the sun, I have tried a plastic window boat polish which is uv protected as well.its not bad but has anyone bought them nearly clear again if so what did you use ?

 

[macd]

It sounds like yours are nothing like so bad is this chap's, but it's an indication of what can be done: http://www.mysailing.com.au/news/how-to-fix-crazed-acrylic
(Assuming, of course, that yours are acrylic.)