Here is a simple refreshing work in one of my 185 bowl shape pipes, it's from House of Smoke.

You can see the procedure here: http://pipe-smoke.blogspot.gr/2010/02/7.html
The pipe code is:
M7-6or you can watch it in a video with slide show photos plus music:
Link: https://www.youtube.com/watch?v=c0kU3iiMRKY
Ladies & Gentlemen thank you for watching!
