+1 Darwin. You nailed it. For me, the S&A treatment is a necessary part of sanitizing estate pipes, or trying to reduce or remove ghosts.
One thing we don't talk about often is how hard this treatment can be on briar... If you think about it, we're creating a pretty intensely active leaching process and are pulling moisture, and the gunk that comes with it, straight out of the briar. This isn't a process I would do with any regularity, and when I have to do multiple treatments (like when I'm trying to bust a Lakeland ghost), I let the bowl stand for at least 24 hours between treatments.
I'd always recommend 99% isopropyl alcohol for this work, it is highly evaporative (meaning it doesn't remain in the briar), has very few impurities and a low water content, and is flavour neutral.
-- Pat