You are right about that, Sally -- I think that a definition of ugly, in the dictionary, should simply show a picture of an Iris borer!
And soaking an Iris rhizome in bleach water to remove and/or kill borers is a time-honored method of dealing with them. But in the case of *simple* rot, it's usually a good idea not to add liquid of any kind to the situation -- generally, the rot is caused by moisture to begin with. So in that case, Comet does the same job without adding moisture.
