I was told the reason not to use the canned air is because there is the propellent in the can that can rust the gears, besides pushing the lint in further. I was telling this to my DH, after talking to some of our guild members about, and he went out, and bought me an air compressor. The guy at the story thought we were going to pressure wash the house.LOL when we told him what it how I was going to use it. The canned air is also flammable of course you turn off your machine, but it could still be plugged in? Never!