What do you need? Pipe cleaners.
How often? Right after every smoke .
How to clean?
-After smoking, dump the ash.
(alternatively, if you need/want to build cake do this first then dump---cover the top of the bowl and shake. This will help distribute ash to the walls of the bowl)
-take off the stem--run the pipe cleaner through it until it comes out white and dry. This may take more than 1 cleaner.
-fold a pipe cleaner in half and run in through the shank to the edge of the inner bowl , continue until it comes out white and dry, repeat as necessary.
That's it.
What about deep cleaning?
If you follow the above measures immediately after smoking you can go years without deep. Caveat- I don't know if this works for heavily cased aromatics, but it does with everything else.