Captainsousie and Bambam go you covered here wheezy.
I started cleaning up estate pipes before I had a retort, and was able to successfully de-ghost pipes, and clean/sanitize bowls, shanks, mortise and tenon, stems and bits with the right combination of pipe cleaners, q tips, brushes, isopropyl alcohol and patience. The retort does seem to help speed this process up.
Do search youtube and watch how retorts are used, and do follow the safety recommendations of folks that use them regularly.
Cheers,
-- Pat