k-r focus screen

The focusing screen on my k -r is covered in fine fibres i changed a lens while wearing a black fleece i have tried to blow them off with a blower but it just moves them around any got any ideas how to remove them?.Also might consider changing the screen for a split prism i have found one at focusing screen.com any one used them .All advice welcome
geordie

The trick with blowers and focussing screens is to hold the camera above you and blow upwards into it. This way the dust will fall on you, but that's Karma's price for getting fibres in there in the first place.

yes tried that no joy