Thanks for the suggestions folks... sounds like standard screen cleaners will do. I get nervous about these things, never having really got over thinking wire wool would be perfect to polish the plastic front of my bike speedometer when I was 10. As for piss taking... thanks for the support but I'm the last person to be in a position to complain about taking the piss. I took it as the well meant smartassery I think (hope) it was intended as. Matt