I have cleaned many estate pipes and I basically do the same as other members have done.
I also find it relaxing.
I am a bit of a fanatic about my pipes being clean, so the procedure I go through is quite long.
Before I put the stems in Oxy Clean I go at it with a brush and scrub out as much gunk as I can, I also take the magic eraser to the stem.
Then I will put Vaseline on the markings and soak the stem or stems overnight.
I put at least 2 scoops of Oxy in my measuring cup at the 2 1/2 cup mark.
Next day, I take them out scrub again with the brush inside, and scrub the outside again with magic eraser.
If any, and I do mean any dirt is still inside the stem I will repeat the above .
I have had some estate pipes where the stems were so dirty it took 3 days to get them spotless.
Next I take a 1500 Micro Mesh Pad wet and scrub, till I do not see anymore brown.
Than I work my way through the Micro Mesh Pads from 1500, 2400, 3600, are wet sanding.
Than I use Meguiar's X2.0 Scratch, and finish up polishing up with 6000, 8000, 12000, dry sanding.
I will put pipe cleaners through with rum 151 several times through out.
At this point the stems are gleaming, sterilized and look great.
I figure if I am going to smoke through this, it better be spotless and sterilized.
The Pipe Bowls get reamed and if I am going to remove the old stain, I will soak them in ISO 99% if needed overnight.
If the rims are badly gunked up I will carefully sand it down a bit with fine sandpaper in the figure 8 motion on a flat surface.
I will do the alcohol bath with Rum 151 ( strongest I can get legally ) I will use cotton balls or Kosher salt and they are left overnight.
I do have a Retort, but it just seems like a bloody science project on the videos I have watched.
What I do in cleaning my estate pipes sounds like a lot of work, but it really isn't.
I have rescued many sad looking pipes.
The only time I have sent a pipe out to be worked on was when I got my first Dunhill Pipe.
Ed, made the Dunhill Pipe look like it was new. Great work.