PC hardware enthusiast der8auer uses a dishwasher to clean his components

What about oxidation and rust?
"Rust" specifically is "Ferric oxide". And while I expect copper to be susceptible some form of oxidation, there isn't that much iron or steel present on PC components. The mobo to case screws and the CPU clip are steel , and that's about it. Tin, lead, and aluminum might react long term, but not in the span of a dishwasher cycle. The mounted electronic components are covered in waterproof dielectric materials.

I guess basically I'm saying that, "solder doesn't rust", and phenolic doesn't absorb water. (At least AFAIK).
 
Long story short, we've been doing this long before internet and YouTube sensation made some famous.
 
I tried this with my mobo long ago in the shower but it actually died. Maybe I didn't take out the battery? Or put the cpu protection as they suggest, or maybe I didn't let dry enough?(gave it 24 hrs). Who knows, but I've never tried such a thing again. Period.

My money is on the battery. You submerged a motherboard that was still essentially powered.
 
I used to work in circuit board manufacturing. Boards go through a wash to remove all of the solder flux after they go through an oven that solders all of the surface mounted components. We had a de-ionized water source, and boards were blower/air dried before power on testing. All of the boards in your PC have probably been through a wash at least once in the factory already.
 
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