On Diastaicus, it sounds like they had equal results with that and Brett. Not absolutely sure. They also tested lactobacilli with similar outcome. It looks like iodophor is just slower than ethanol across the board, so not suited to spray bottle use.
Martin, once after a summer hiatus, I found mold growing in my Star San bucket!
I just used WB-06 on my wheat beer. I’d not thought about rubbing the fermenter down with everclear prior to next brew to eliminate the Saccharomyces Cerevisiae Var. Diastaticus. I guess I’ll rub down the the jumper hoses and keg once it kicks as well.
Short of relistening to the podcast, I believe they suggested a 70% ethanol solution for spray bottle use, as it would evaporate slowly enough to give a sufficient contact time. The 190 proof might need to be cut. I see the stuff that's legal here in Ohio is probably 151, so just about right. Makes me think you could use any high proof vodka.
Or just use iodophor in a good, long soak for objects that can be adequately covered, like kegs, parts in a pail, etc. I'm sure something short of Bryan's 8 hours would do, but if I was concerned about diastaticus
I would not begrudge the time. If really worried about cross contamination from that, or Brett, or whatever, why not increase the concentration to 75ppm and rinse?
The real lesson of this presentation is just that we shouldn't expect 12.5-25ppm for 2 minutes or 10 minutes to perform as advertised, not that iodophor doesn't kill stuff. It does. Although they point out that, unlike ethanol, the mechanism whereby it kills is not yet understood, which makes it harder to predict its performance.