I actually make it a point to smoke every bit of tobacco in my bowl. When the bowl is finished, I take my pipe nail, paddle side, and scoop the ashes away from the draft hole. Then I slide a pipe cleaner through stem, shank and draft hole till it just starts to enter the bowl. I then put the palm of my hand over the bowl and shake the ashes to coat the pipe walls and heel and then dump the excess. Next I run that pipe cleaner through the transition from shank to tobacco chamber a few times to gather any moisture, remove the pipe cleaner and place the pipe upright with bowl to the ground to let any moisture drain towards the bowl.