Um, basically, any product that says that it is supposed to remove "toxins" is horsesh!t. There's no coherent class of substances that make up "toxins". Yes, there are toxic substances in our environment. Yes, we ingest and and inhale them. But for most of us in most cases, the normal defenses in our body (our liver, our kidneys, the mucociliary escalator, coughing, peeing and pooing) can get rid of them. If you've been poisoned by a SPECIFIC toxin, like, for example, lead, you need medical treatment that will SPECIFICALLY help your body rid itself of lead. Other "toxins" don't have the same chemistry and won't be removed from your body with that treatment. But even with poisonings, most of the treatments are supportive anyway. Your team tries to help your organs function while your body clears the "toxin" on its own. You cannot eat or use some magic product that is going to suck "toxins" out of your body.
This is a good, accessible piece about the lack of benefits and possible dangers of colon cleanses:
http://healthland.time.com/2011/08/01/colon-cleansing-not-so-cleansing-after-all/
And, just for the record, I have no idea how those products that help you pass a drug test for marijuana work. Having watched a housemate use them back in college, though, I suspect the products are basically electrolytes that allow the user to drink massive amounts of water (and dilute the drug), while still maintaining yellow, salty urine.