Electronics and liquids are just not a great combination.
Unless of course you stick to pure alcohol or distilled water…
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Most electronics are just fine. A few capacitors, and LCD displays are not fine with water, and probably a few other things I'm not aware of. However most electronics parts are encased in plastic or ceramic and just fine. In general mineral build up from washing in tap water once or twice is not significant, though if you are talking about hundreds of washings it will become a problem (depending on the quality of your local tap water). Deionized water is best if you can get it, but even that will harm a few components.
In general if you can wash it once (meaning components that cannot handle water are not used in this), the screws rusting out will be the next thing that gets you from washing.
Yeah but there are solutions. After years of being vulnerable to water the iphones are now waterproof. Cars have had engine electronics in boxes with wax in for decades. The cheapest stuff you buy in supermarkets comes in waterproof packaging.
All the things you listed arent things you interact with by pressing on them thousands of times in a day. Its a hard problem to make a keyboard that feels nice, looks nice and is waterproof. Its even harder if you know that the payoff isnt that marketable, I dont think I have ever seen a mainstream laptop advertisment talking about that you can spill stuff on it. Phones barely have buttons or holes anymore and it took us quite a while for the flagship-phones to be water-resistant.
I interact with my iphone by pressing it many times per day.
I'll give you that keyboards are hard but my thinkpad had a good keyboard with a drip tray and drainage hole.
Here's one on Amazon with good reviews https://www.amazon.co.uk/Keyboard-Waterproof-Ultra-Compact-P...
You touch it. You're not actuating any mechanisms.