The way detox is often presented-- "3 day green juice detox challenge!"-- I think it often is a myth, but detoxification is something that our body is always doing. It's a primary role of the kidneys and liver.
Arnold Ehret's Mucusless Diet Healing System
The above books are the best sources I've come across that discuss detox. Especially Arnold Ehret's book. That one really rocked me to the core and changed the way I view a lot of things. It's super cheap and it may help you understand your situation.