Vacuum cleaner...

And the most important attribute of all: a Kenair Air Duster canister, since I started using these to clean up my negatives and holders just before printing, I can print at least 80-90% of my prints dust free. The valve / ventilation system of these canisters is excellent. Many other types don't give a strong air flow when the canister is halve empty, not so with these, you can use the canister right up to the point where it's almost empty.

Of course, if you have the money and space for a compressed air system, that is even better...