I remember being warned off these "Green Tea Detoxes", as they are not a scam exactly but achieve any results with a strong laxative effect (extra strength senna among other things) which, erm, "empties you out" and that's what "aids" the weight loss. It doesn't help in the loss of fat really.
That said I do drink matcha and mint teas (normal strength) as I find they help with bloating and indigestion as part of a healthy diet rather than going on a big cleanse or detox. The best thing for Detox? Water.