Care and upkeep
What actually decides how long a thing lasts, often a single habit.
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Cleaning a mechanical keyboard, without stripping it
Fifteen minutes is enough to get a crisp keystroke back. A full teardown is worth doing once a year at most, and not for cleanliness.
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Descaling a steel bottle without ruining it
Limescale and that metallic taste come from the same place, and white vinegar handles both. What you must never use on one, on the other hand.