We should change the name from Cake to Carbon.
When I think of Cake, I think ‘Thick’, when I think Carbon, I think ‘Thin’.
SO, the point is, you don’t need any thick cake build up in a chamber, you only want 1 mm of a carbon build up, and I personally probably only have 1/2mm in my pipes.
I think you are looking at this the wrong way.
Pack your pipes, smoke them, when it starts to become a white ash you can see, and it’s taking more time than usual to light the tabac, if you use a Czech tool, use the pick, and carefully scrape off the white ash, but leave a tiny bit, don’t expose black/charred looking tabac, because it will taste bad when you light again.
Then use the weight of the tamper to even out the tabac, don’t press down, after scraping away the ash to make for an easy/even light.
Just as you are done smoking, dump out what remains in the chamber, and run a pipe cleaner through it.
Next, take a paper towel or napkin, and wipe the chamber out, put your finger in either one, down inside the chamber and spin it around, pull the napkin/towel out, pick a clean side, stick it back in, and spin again, until napkin/towel is clean.
I also personally stick my finger inside the chamber when warm, because the carbon will be more pliable, if there are lumpy spots, you can rub them down, or take out, making for a nice smooth even layer, also removing any lint from the napkin/towel, if there is any inside.
When you are done, on a pipe that has already been smoked quite a few times, you should now only see a light, paper thin sticky black carbon build up, and that is all you need the entire way through, but it doesn’t need to be all the way to the bottom. The bottom 1/8th of the chamber can just be dark, you don’t want to char the airway with the flame, smoking all the way to the bottom, no need to smoke it completely to the bottom, so you don’t ruin a nice pipe.
Enjoy!
P.S. Just think about this process for now, as I’ve pointed out.