I should add that I wasn't intending to advocate the use of detergent products, just commenting that it's not impossible for them to have an affect on rust, as the study illustrated. As they said in the study for Ultra Dawn: "Although the two treatments (17 & 31 July 2002) were not observed to cause phytoxicity on these plants, we do not know the effects of longer term (e.g. season long) multiple applications of diluted dishwashing liquid on daylily plants."
