Even when you're wearing an anti-static strap, handle all components by the edges. Not only does this diminish the possibility of damaging component with ESD, it keeps body oils off of metal contact points.
Before closing on the topic of contamination, we have one more consideration. Dust does a very poor job of transferring heat.
After ESD, heat is the next villain a PC must contend with. According to www.engineeringtalk.com, "Excessive temperature causes more failures than vibration, humidity and dust in industrial computer systems and accounts for 55% of all electronic equipment failure."
Given this data, vacuuming out a PC from time to time might seem like a good idea. Dust is such a pervasive enemy many certification exams test for knowledge on topics ranging from clean tape heads HVAC and server filters.
Of course dust isn't fussy, and will collect everywhere. Keyboards should get a regular dose of 'canned air' or gone over with a vacuum.
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