The doshas are more then mind/body types. The doshas govern all of our physiologic functions in the body. When one rises to excess we use ayurvedic cleanse methods to reduce it. Understanding which dosha(s) is out of balance helps us to determine cleanse methods, dietary augmentations and herbs. Understanding your vikruti (imbalance) is more important then knowing your prakruti (essential nature) when it comes to cleansing with ayurveda. We are all working from the level of imbalance. Over time, as the imbalance is removed your true nature will be revealed to yourself. It may be, that you are already in balance, in which case you will be using the ayurvedic cleanse methods for preventative reasons.