I’ve been cleaning electronics for years now—boards, components, the whole nine. And one debate keeps coming up: can you really use tap water, or is distilled water the only way to go? Let me break it down.
Here’s the thing nobody’s talking about—the difference isn’t just about “can it work,” but how long it’ll work after you’re done.
SIDE A Tap water seems convenient, right? Especially if you’re in the UK or Portland like some folks claim. And it can work—if you’re meticulous about drying. Adrian’s Digital Basement does it, and hey, if it’s working for him, there’s definitely a case here. Tap water gets the job done fast when you’re dealing with simple boards or quick cleanups. It’s accessible, it’s cheap, and for some situations, it’s “good enough.”
SIDE B Distilled water is the pro choice—and for good reason. It doesn’t leave mineral residues that’ll corrode your components over time. When you’re working with something sensitive like a laptop motherboard, or anything you actually care about keeping functional for years, distilled is the only real option. The extra step of rinsing with distilled (or even using an ultrasonic machine) might seem like overkill until you see what mineral buildup looks like six months down the line.
THE REAL DIFFERENCE Here’s what most people miss: it’s not just about immediate drying. Tap water might leave no visible residue right after cleaning, but those minerals stay behind on a microscopic level. They’ll attract moisture, conduct electricity when they shouldn’t, and eventually cause corrosion that distilled water would have prevented. The thing nobody talks about is that “UK tap water is fine” only holds if your definition of “fine” is “not broken yet.” After years of using both, I’ve seen boards that were “perfectly cleaned” with tap water start failing years later—always the same pattern.
THE VERDICT From experience, if you’re doing quick fixes on throwaway components or you absolutely can’t get distilled water, tap water might work—with aggressive drying. But if you’re cleaning anything you actually value, go with distilled every time. Here’s my take: simple boards, occasional use? Maybe tap. Laptop motherboards, critical components? Distilled is the clear winner. Don’t let convenience trick you into a false economy.
Final Thoughts
That “it dried fine” feeling is the electronics equivalent of “it’s not cancer yet.” Save yourself the headache down the line and just grab the distilled water. Your future self will thank you when that board is still working in five years.