From the inside the glass is fixed and outside it's not accessible (as I mentioned) so spraying is not possible but for the same reason (being kinda remote) they don't bother me. Once they tried to build something at my balcony's rail and I stopped them with a water nozzle. They didn't come back at the same spot ever since 🙂 It's impressive how fast they can be. Can you believe that they managed to build a nest at my car's engine bay? This means they finished it in only a few days the car stayed unused.