Killing Wasps with Soap

I only get about 2 hours to myself each day when my toddler naps. Today as soon as I got him down I went outside to do some gardening. I went over to my compost to get some soil and wasps came swarming out. There were about 5 little wasp nests under the board that I keep on top of my compost. I went to the garage to find a can of wasp spray, but had none. I did not have time to wait until I could get to the store (I only get that 2 hours and I really wanted to garden).

I turned to google and found my answer:
http://www.ehow.com/how_4447281_kill-wasps-safely-naturally.html
I learned from this article that I could fill up my son's super soaker gun with dish soap and water and kill them. This would also allow me to stand at a safe distance.
From now on I will never waste money on a can of wasp spray that is bad for the environment again. Soap works just fine and is safe and non-toxic.
After spraying the area I did not have time to wait for the wasps to die, so I just went in and got my soil and they left me alone.
I got all of my tomatoes planted and even got to use my new watering can that I just bought at Savers for $2 (It is big and sturdy, not like the cheap flimsy ones that I waste $10 on and have to replace every year).