Do you mean you want to do a Head Wash? If so, be prepared to waste a good bit of ink. In USER Mode, select Head Wash and it will prompt you where to put the cartridges.
Beware, once you start a Head Wash, you have to let the printer run its course. Make sure you have enough cleaning carts to complete the process as well as enough ink to refill the lines when prompted...
BTW... why do you need to go to this extreme?