Anybody ever do a detox?

OK - anybody ever done a detox? I'm pretty healthy, but lately I've been eating pretty poorly and its' REALLY showing on my face - I hate being a 31 year old with pimples - oh well.

I'd like to clean out my system and a friend recommended a week long detox. Days 4-7 are fine (lots of water, lean fish, salads, fruit - no food combining) but the first 3 days is ONLY MELON AND PINEAPPLE. . . I'm not a health professional, so I thought I'd ask around if anyone has done this.

Thanks in advance

I'm on summer break from teaching so I'm only working part time - I dont know that I'll do the three days of melon and pineapple - maybe I'll try it for a day and then skip right to day 4.