There are a few things you can do to clean a period cup in public if you’re feeling like you need to get it out. First, try using some soap and water to clean the cup. If that doesn’t work, then you can also use a plunger to suction onto the cup and push and pull until the period is removed. Finally, if all of those methods don’t work for you or you just feel like it’s too difficult, then you can try using a vacuum cleaner to suck the period out of the cup.