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PSA: My cold brew batch went sour because I left it on the counter for 2 days
Totally forgot about it after a long Tuesday and it started smelling like old gym socks. Poured it down the drain and went back to the fridge method, 18 hours max. Anyone else made this mistake or am I the only one lol?
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averymartin3d ago
Cold brew souring that fast usually comes down to how clean the pitcher was, not just the time on the counter. Any milk protein or old coffee oil left in the corners feeds bacteria way quicker than people expect, so even a 12 hour batch can turn if the jar wasn't scrubbed well. A vinegar rinse before each batch has kept mine from going off, and it also fixes that weird stale taste that shows up after a few days in the fridge. Two days on the counter is still a gamble though, so the fridge method is the safer call either way.
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