If you're looking for low maintenance, why not just make sure you don't have dissimilar metals anywhere in the system? Do you still care about the anti-corrosion additives "wearing out"? Will they wear out / break down / dissipate / whatever they do - if there's only copper and brass in a system? Or is copper going to form a film of corrosion even in a same-metals system?
If you want non-conductive, what about de-ionized water by itself in a same-metals system. Yes, it will re-ionize, but how much? Enough to matter if some is splashed on a motherboard?
FWIW, I've had a couple of leaks - always in the "pretest" phase, so always with simple distilled water, and electronics haven't been "live". So far, I've just dried it off (sponge off / suck out puddles, then air dry) and everything's been fine. Would this distilled water have killed my electronics if it had been live?
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