Be sure to snap a picture of that nest, you might make it to guinness. The biggest I've ever seen was less than 2 feet long. One way of making your home wasp proof is install screen on each window and plug all the holes. An check every now and then also ensures those insects won't sneakily build another nest. Haven't tried that spray stuff but the nest is probably too huge to be dissolved and you still have the wasps to worry about.