That's got to be the best thing I've seen. Using a blower usually backs the leaves up at one of the hangers. A version of the power wash dual head might be one fabbed up to use compressed air. Personally, I'd rather deal with a dry mess than a muddy one.

Now I'm curious. I have a house with gutters that haven't been cleaned in a few years. We are replacing them, but I'll try the power washer thing first.

Using my largest backpack blowers will clear gutters...leaves, packed wet muck, small branches, etc. best imo...simply a BFH that overpowers it past the gutter nail, brackets, etc....just my experience.