Wasps have been incredibly bad this year where I live. People who have never been allergic are having anaphylactic reactions after a second or third sting. I do not blame you for grabbing the chemical spray to protect yourself.
Better safe than sorry with the fabric. Perhaps a trip to a laundromat with the huge washers will help to get the job done more quickly?
Me, I choose not to use wasp spray as I worry about the effect on my health and my pets. I will open a window if possible, cover with a cup, squash etc.