A number of "us" don't build cake in our briars. We scoop out the ash, wipe out the bowl, clean out the airway with a pipe cleaner, and buff the pipe with a cloth. This allows a thin carbon layer that does the job of cake, preserves the size of the chamber, and eliminates the need for a reamer. I have pipes I have had for forty years on this regime, and they smoke great and wear extremely well. No rules on this. Some people consider cake-building one of the central joys of pipe smoking. Likewise, I find this other method best for me, as do a number of other Forums members.