Grab the dusting feather thing, and while you make certain that nothing is on top of any rack or projector, give a quick pass to keep the dust down.
Don't clean the port glass, but note down which ones are dirty.
The same with the lenses – should a task force be sent to clean them or the 3D equipment?
Dust on the port window and lens can cut down the light level on the screen by 10%. Wasted electricity, and sad customers.