Haven't tried it myself, but I've heard horror stories of how the dishwasher makes it foam up way too much... foam pouring out of the thing and making a mess.
If you do try it out, make sure to take pictures!
I fill and drain my bottles in a bucket of StarSan by hand. It only takes a couple of minutes to do two full cases and I know it's been done correctly. The way I see it, the bottom line is putting StarSan in your dishwasher is using it in a way it was never intended to be used. So it might work, and it might not. And if it does work it will probably work inconsistently. So to be certain, you'll probably want to fill and drain them by hand anyway, which means you've just wasted however much StarSan you put in the dishwasher. And how much would you put in anyway? How many gallons of water does a dishwasher use per cycle?
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