I don't build cake, but scoop out the bowl each smoke and then wipe it out with a piece of paper napkin or towel, keeping a thin layer of carbon that never requires reaming. I wouldn't let a knife blade near a pipe bowl. I do have a good small collection of pocket knives, but for other purposes. My pipes appreciate this and live for decades. For pipe tools, I'm a major user of pipe nails or horseshoe nails, with a tamper on one end and a scoop on the other. Such simplicity, I think it is one of those unheralded miracles of design; it does the job well, costs next to nothing, and if you consider that -- it's quite beautiful in its own right.