My favorite is when the owner is a heavy smoker. The nicotine and dust combine and turn into sort of a cement. When I get one of those, I pop the drives and battery out and scrub everything down with Simple Green.
This guy I know will toss everything but the hard drives in the dishwasher. Sounds crazy, right? But it works, as long as you dry everything completely, and make sure to take the CMOS battery out. It'll come out looking and smelling brand-new.
I'll admit, I used to smoke like a chimney, and kept my tower on top of the desk for easy access. Now I took good care of the inside, but over about eight years, the front panel of the case turned from silver to brown. It looked like a piece of wood! It happened so gradually I didn't even notice. One day, I needed a number off of there, and I couldn't even read it. So I sprayed a rag down with cleaner and wiped it off, and instantly turned the rag brown. I stripped my whole system down and gave the whole case the treatment, and ended up having to toss five or six shop rags. That was one of the things that got me to quit smoking. o_o;
Most systems I get for virus removal and such, I take a look inside, just to blow the dust out, since it only takes a second. It amazes me how few people bother to do it. It doesn't really take any technical savvy to get a can of compressed air, or even the vacuum cleaner if you're really careful, to clean that out. But then, irresponsible owners are a geek's number one source of income, so I won't complain too hard.
What have you guys found in systems?
This guy I know will toss everything but the hard drives in the dishwasher. Sounds crazy, right? But it works, as long as you dry everything completely, and make sure to take the CMOS battery out. It'll come out looking and smelling brand-new.
I'll admit, I used to smoke like a chimney, and kept my tower on top of the desk for easy access. Now I took good care of the inside, but over about eight years, the front panel of the case turned from silver to brown. It looked like a piece of wood! It happened so gradually I didn't even notice. One day, I needed a number off of there, and I couldn't even read it. So I sprayed a rag down with cleaner and wiped it off, and instantly turned the rag brown. I stripped my whole system down and gave the whole case the treatment, and ended up having to toss five or six shop rags. That was one of the things that got me to quit smoking. o_o;
Most systems I get for virus removal and such, I take a look inside, just to blow the dust out, since it only takes a second. It amazes me how few people bother to do it. It doesn't really take any technical savvy to get a can of compressed air, or even the vacuum cleaner if you're really careful, to clean that out. But then, irresponsible owners are a geek's number one source of income, so I won't complain too hard.

What have you guys found in systems?