For the second year in a row I have multiple wasp nests in the high peaks of my roof eaves. Last year I did my best to get rid of them by using a telescoping power washing wand. This is the only way I feel comfortable getting to them since they are probably 25-30 feet in the air and I am terrified of ladders. This year the nests have come back and are larger than ever. I was able to spray 2 of them so far with Wasp spray but I still see some wasps in the nest after a few days. One i sprayed again. It there a better way to get rid of these nests, and better yet, a way to keep them from coming back again and again?