Cranberry juice will NOT clean your system. It is a diuretic, which means it makes you pee a lot. If you are asking this question because of an upcoming drug test, the only way cranberry juice will help you pass is because of it's diuretic properties. Basically, if you drink water to try and beat a test, and it works, it will only work because you're literally just peeing water, and not drug molecules.
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It is a myth that cranberry juice, or any type of beverage, cleans your system of drugs. When you take drugs the chemicals get in every nook and cranny within your body. While your body will clean itself out over time there is no way you can do this by ingesting a certain type of beverage.
There is no good evidence to say that cranberry juice will clean drugs out of your system. Do NOT rely on it.
Neither cranberry juice nor cranberry pills will clean any drug or drugs out of your system.
Cranberry juice doesn't "clean" your system - your kidneys and liver clean the toxins out of your body. It depends on what you're trying to "clean" if you want to know how long, though.