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How long should I keep something immersed in StarSan/swish it around for to ensure that it's as sanitized as I could reasonably hope it'll be?

I know everyone has a rule of thumb for this (I use 1min myself), but I was wondering if there are any hard numbers (culture tests or contamination rates etc) for this. How long does StarSan take to effectively sanitize something (clean plastic or metal)?

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Charlie Talley from StarSan has said that 30 second contact time is 99+% effective. That is based on tests that they've done. Immersion isn't necessary. I keep StarSan in a spray bottle and just spray things down, wait 30 seconds, and use them.

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