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If you can raise the humidity as high as you can get it with a humidifier or something,then it won't last long at all.Humidiy and heat will make pollen inert faster than anything else.Maybe you could spray the area with water out of a spray bottle and then wipe it off.
I'd do as JLP sugg. spray & wipe the room down before the next crop goes in ....then no worries. I personally just for sterile reasons mix a lil bleach in with my spray (water)bottle & hit the walls/ceilings & floors after each harvest...of course if ya can do it & arn't doing the perpetual harvest thing & have plants flowering all the time in the same spot. Best of luck 3ld