Flame polishing wins again - I remember that someone described this method in great detail last year.
Ah, yes, is was Matt from Geelong: http://aussiepinball.com/index.php?topic=1568.0
thanks for the link, the flame on my blow torch is not as hot (as the blow torch in the link) but the flame is about the same size.
its a bit hard to see the flame in my picture.