Question about a cleansing?

So it's almost summer and every girl has those couple of extra pounds they want to shed before its full blown bikini season right? Well, at work this afternoon a coeworker said that she always looses five pounds in three days by doing a cleanse. So my question is, do they actually work? What exactly are they? Do you basically just pee and poop water for three days? Would you/ have you ever done it? I googled it and saw sooo many mixed reviews so I'd appreciate all opinions. Thanks
Question about a cleansing?
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