Now I remember: according to Goenka the sankharas are stored in the body (or mind) and come to the surface as sensation. Thus if one looks long enough at the sensations the store will be emptied and the mind is purified in this way. I wonder where this way is explained in the Tipitaka or by the Buddha. I guess nowhere.
Sankhara (=san+khara) is action by the mind which leads to kamma depending on the defilement/avijja involved. Kamma is stored as energy in mano loka. If actually kamma is meant to come to the surface via the body, then the Goenka technique teaches to eliminate all kamma in order to attain Nibbana. That would also be in contrast to Buddha Dhamma which says to remove defilements/gathi/tanha/asava in order to attain Nibbana.
The technique involves no contemplation and comprehension of the Tilakkhana which the Buddha revealed to the world. The question is how one can attain Nibbana without comprehension of the Tilakkhana?