Leslie, yes I do get a lot of leaf spot. There are many rain days here and little sun, even more so as I live in the forest. However, as I already mentioned, for me personally, sanitizing my cutting tools are not primarily about limiting spread of fungal leaf spot.
There are more important pathogens to worry about, which may or may not be problem for you at this time.
Tom, to answer your question there are both fungal and bacterial leaf spot, so their way of spreading are different. Bacterial leaf spot infects the leaf tissue(but not the rhizome) and spreads by tools and splashing water, not by air. So yes sanitizing your tools and removing the infected foliage is almost the only possible way to limit its spread. Does it work? I don't know, simply because I would have a hard time distinguishing bacterial and fungal leaf spot from each other.
For fungal leaf spot I think the best you can hope for is to limit it a bit. Certainly it works to some extent when you transplant as you then both move it to a new location and cut the leaf tips. The foliage is definitely healthier after transplant.