Dust / white spots on prints

I am using a Canon iP8750 and around 1 in 3 prints are ruined by dust (ink not hitting the paper so leaves a white spot).

I am trying to be as careful as possible, keeping the paper boxed and loading just before printing. I am also inspecting the paper and using a dust blower shortly before the paper goes through to try and remove anything but it still happens.

How can I eliminate this?

Thanks