The black light thing seems like an accidental discovery though. I imagine it's pretty difficult to "accidentally discover" that you can fix some motherboards by dunking them in soapy water...

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Err...I did. Got a dead Mac II which didn't want to do anything so, being a conscientious soul, decided to clean it inside and out (so that it was clean and pretty). Then plugged it all back together again and figured I'd try to get the PSU to fire up, spin its fan and dry the thing out (I know, I was young and foolish). Bingo, it chimes into life (and then I had the headache of finding a new hard drive, sorting out floppy drives etc.) 8-o

Only later did I find out that other people did the same thing