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The point is completely valid for daily use but fails a bit when you take the analogy further and consider buying and using used tooth brushes.

I was using straight isopropanol but that 92 percent stuff still evaporates much faster than water.

That was me, but it was not to sterilize as it would be of little use for that. Its purpose was to remove water and to leave oil behind. It worked fine for me for years and I recommended it to...