Perhaps the quickest and easiest way to keep the dust from your monitor is to invest in some pop-up screen cleaners.
Any who has ever used something like Baby Wet-Ones will be familiar with this idea.
The screen wipes come in a plastic bottle or pack. They are all moist and permeated in screen cleaner. You pull the top one free, close the packet and wipe down the screen.
Dust and grime are absorbed into the wipe and your monitor sparkles at the end. Then you simply discard the wipe.
I've used these. I think just about everybody has, who's been around computers long enough. In fact, a brief exploration of my PC accessories box has turned up a packet right at the bottom.
In their favor, they are very convenient and they do the job. Depending on the size of the pack, they are also easily shoved into a laptop case to be used on the move.
But the reason that my packet is dried and half-forgotten is that I didn't like the streaks they left.
My screen would be beautifully clean within seconds, but then I'd spend the next two minutes trying to wipe away the residual cleaner.
If you are going for this option, research the comments of each product to find non-streaky PC wipes. It'll save you a lot of effort later on.