Answer: a maintain tools Making sure the tool is unplugged. Use  compressed air to get rid of excess dust. Then take  your rag.

a the correction or prevention of faults in hardware by a programme of inspection and the replacement of parts. b the removal of existing faults and the modification of software in response to changes in specification or environment. (C14: from Old French; see maintain)

Preventive maintenance is the systematic care and protection of tools, equipment, machines, and vehicles in order to keep them in a safe, usable condition, that limits downtime and extends productivity