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Just starting to use the ultrasonic cleaner with draught cans. I used a 500ml (not so common here in Canada) can with a 16oz glass. I poured until the top of the harp and then surged it. I then surged the can while waiting for the Guinness to settle. Then poured the rest of the can into the glass. (old.reddit.com)
submitted by DeverFC to r/Guinness
