Thanks for bumping this Peter, I forgot to update!
Psoriasis is still angry and itchy, but certainly no worse than usual. I was coming down from a flare-up, and now it's about normal, so that could be the Listerine or just luck. I'm going to keep it up as a pre-wash scalp treatment and see what happens. I used it undiluted too, but stupidly I can't remember how much I used. I kept going until I'd gotten everything, but it certainly wasn't enough to make it drip or anything.
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