If your business is expanding and your CIO asks if you should set up an extra printer only for the executives, what common item might be used to clean the dust off the old printer? You grab an old printer from the back storage closet, but it's covered with dust from sitting for too long.
Compressed air should be used to clean the insides of printers and machines of dust and particles. This is usually wrapped in an aluminium bottle. It is better seen in an open area or outside.