The bowl of your pipes, that is! :D I’ve always practiced the art of pulverizing any left over ash chunks into powder, then shaking them around in the bowl for an even distribution on inside of the bowl. How I learned is that this will aid in building a solid cake more quickly. I’ve recently begun wiping a few of my pipes after smoking with a clean pipe cleaner, and really don’t notice any difference in cake formation. What are your thoughts on this? Should we all be wiping? Is wiping a matter of preference? I will definitely say that I prefer clean bowl to one that has ash spread throughout when loading it for my next smoke.