From what little I've read, Cypermethrin is used for ants, Fire Ants in particular. You might want to do some more research on this chemical as well as how to 'rid' your house of Wasps.
Here's a link that may be of use. (It includes Ants, Fire Ants, and Wasps among others.) Pests By Name.
If it's cool/cold enough where you live, you can do, basically, whatever you want. If it's not that cool (or you live in Texas or Florida or something where it's really 'mild', wait for evening when it's cool. The morning sun will 'stir' them which is when you DON'T want to be around them.) Assuming it's OK to deal with them, if you don't have to remove the shutters, don't. Just 'knock' the nests off. Spraying won't do anything because they aren't around. Periodic inspections of the shutters will dictate the activity of the Wasps. Remember, ONLY do what you have to do when it's COOL out (like in the evening.)