Question Author
What got you going Zacs - the blowing or sucking?
Thanks for the compressed air suggestion, I think there might be some of that in the garage, I'll try tonight, can't see the vid at work at the moment fender, will check it later.
Methyl it's a Samsung HD videocam, might try the mains power thing. Definitely not dropped or knocked but has been in a beach bag, I'm 100% it's a sand grain or two.