You can attach a length of soft copper tubing to extend the reach of a blow gun nozzle used with an air compressor. The extra length will allow you to clean out motors and interior machine parts without getting a face full of dust. The end of the tubing can be bent to reach around the back side of motors or into other hard-to-reach areas. Use a wet/dry vac along with the blow gun to help keep dust out of the shop.
For a high level of security, select padlocks with pin-tumbler locking mechanisms, shackles of high-tech alloy steel to provide pull strength, and special weather-resistant plastic covers to stand up to the elements.