how can you non-toxically and permanently remove an active wasp nest, which is located inside an air conditioner?
The air conditioner is in second-floor window. Every few days one or two wasps (? paper wasps; lower New York) find their way into the room; these I kill. All other active wasps go in and out of the air conditioner on the outdoors side. Two years ago this same scenario happened ... I left them alone and read that they rarely inhabit the same nest the following year, which was true in my case, and therefore I vacuumed out the nest in the air conditioner and used it last year. This year they are back! How can I permanently get rid of them?