Alcohol is a bad idea.
Absolutely don't let any liquid in any aperture.
Though phones and keyboards can harbour awful bugs, if it's only one user, then it's your own bugs you already have.
Cleaning a keyboard is really hard. We used to wrap ones in dusty factories in cling film. Note it's porous, so zero protection against viruses. It might stop bacteria or amoeba, water will pass leaving copper sulphate behind.
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