Using canned air is bad for the environment and only blows dust everywhere. Capturing dust is a better way. I keep my duster in a clean drawer. A quick wipe with the Swifer on both sides of the glass and your contact neg will really help.
I just got something cheap ($50-60) from amazon. It's a little loud, but works well. A living room one you should probably go a little more upscale for something quieter. More money is probably quieter, prettier, and more energy efficient. I don't have any recommendations on mid-range or better ones. Eliminating pets is the most beneficial preventions. 2nd is using a central vac instead of a portable vacuum cleaner. A hepa vac would be also a better choice than a normal vacuum cleaner.
I keep a HEPA air cleaner running constantly in my dark room. Anti-static cloth or brush for quick dust off prior to session helps. My three dogs have free run of my DR and its no problem, my boxer usually sleeps under my feet when I'm in there.
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Clean and clean some more, but something that people often over look while cleaning the work area is the area where you will be laying out your negatives to cut and sleeve them, and where they will set them before doing whatever it is they want to do with them to print them. Clean your printing mechanism all you want, it will make little difference if you set your negative in dust while you are getting ready to print it. Also right before laying your negative down to make the print, dust it and the paper.
I have several microfiber towels that I use, then toss in the laundry. I have never had a scratch from the dust remaining trapped in them. I use one for the work area, another for the negatives, one for the paper to be printed onto (I do cyanotypes), and two for the glass, one for the first cleaning of the set, and the other every time I change the negative. This works for me, your actual mileage may vary. Please note, microfiber towels are dust magnets, and must be cleaned often even with that they will, not might will scratch something during a print session.
No you can not clean too often during the contact printing process.
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