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Wet Time
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
Rules
ELI5 answer is 90% alcohol dries out the bacteria too fast and it converts into a bacterial spore with a hard shell that protects its insides.
70% alcohol gives it time to penetrate the cell wall and "dissolve" the insides of the bacteria, either killing it or rendering it non infective.