Heck, I don't know. Basic Brewing Radio
podcast on 29 March 2007 featured an interview with Charlie Talley of 5 Star Chemicals (manufacturer of bleach/PBW/Starsan), where
Charlie spent the first 20 minutes or so educating the audience on the proper way to use bleach and vinegar as a safe disinfecting/cleaning solution. Then he talked about PBW and Starsan. Based on that podcast and giving a very cost effective solution versus his own products, won me over and I've only used bleach/vinegar or his products ever since.
I first soaked my speidel in PBW, then in Starsan, and had the recurring pichia infected brew. Then I spent two weeks soaking the Speidel in a bleach and vinegar solution in a bath. I
believe I ex-communicated pichia (which wasn't horrible or anything but contributed a souring effect that wasn't superior), and can keep this Speidel. At least, the current batch doesn't taste like it has pichia, and for what it's worth not even my palate wouldn't miss a pichia flavor.