Detox

I attempted to do one a couple years ago. It was a 2 week one where I wasn't allowed any caffeine, alcohol, cigarettes or red meat. On top of that I had to take copious amounts of detoxing vitamins each day. I lasted 5 days before I threw the plastic jar of vitamins at DH's head.   

I've done the Good Health - 7 day Body Cleanse last year, You do have to take quite a lot of pills every day but you can also do it for a month so you don't have to take so many pills each day.
They recommend that you try and cut-out/reduce processed foods so lots of fresh fruit and veges and lean meat. I did it with DH which was better as we could keep each other going - felt like a long week and I was over the pills by the end of it (and really wanted to give up) but did make me feel better - lighter IYKWIM.

Good luck with what-ever you decide.

I did the cabbage soup diet, google it if you are interested. It was tough sticking to it and I haven't been able to do it since but during that week I felt so good and it helped kickstart my weightloss at the time.

I did one a few years ago. Only a 5 day one but all I could have was freshly juiced veges beetroot, carrot, celeriac and apple. It was REALLY hard!
TMI....Beetroot makes your poo red! and by the 5th day so is your pee.

I felt sooooooooo good after though. I still have the juice 3 times a week but only 100ml.

The best detox you can do is give up/cut down on junkfood, smoking, alcohol. Eat lots of healthy food, exercise and get enough sleep. Do that for a week (or the rest of your life) and you'll be much better of than a week of starving and expensive drinks. Boring but it works.