I think removing dust spots from scans is a way of life if you scan film. A puff of compressed air and careful use of an anti-static brush will help.
And 2 hours with the despotting tool in Photochop before you send the file for printing. Nothing, nothing at all will ever replace this singularly critical point in the process: to de-spot the image at 400%.
.::Gary Rowan Higgins
A comfort zone is a wonderful place. But nothing ever grows there.