plumbers goop has acetic acid in it and will damage the PCB over time.
Water doesn't stay deionized. If you get it to work at all, then after a few weeks CO2 will diffuse in and then convert to HCO3- and wreak havoc. Thats assuming you can get all the ions off your components to start with (doublful). This is a pretty poor idea (take pics of the aftermath, but don't get electrocuted).
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