A couple of notes.
Wear a facemask if you are opening the computers and finding dust etc. If you are opening power supplys, id suggest dunking them in some wrm soapy like water first. I add some cleaning alcohol, just a tiny amount. You don't want bubbles, just enough to break the oils up a bit.
The black dust just balls up and the boards go as clean as the day they were made.
As soon as I open a computer I spray the inside with weak kitchen cleaner to stop airborne dust too. The dust does make me feel sick, sweaty face and sore eyes. Its probaby inoculating me against germs, but.......
Jewelry. My favorite. There's real nice chips in eproms, the IC with a window on top of them.
In laser printers and scanners there's a long thin chip with a window on it, lotsa gold in that chip and it has a very bright rainbow effect to its silicon chip.
In old school video tape video recorders the sensor chip looks really nice, often a egyption blue colour with gold wires.
Another chip is the opticl sensor from optical mice.
Google image these chips for a idea on what they look like./e
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