If you find where the wasps go in an dout you can spray some stuff onto it, but I never got round to do it when there were only a few, then there were more, but they did not get into the inside of the shed. Outside they did not interfere with the goats at all... But I was worried, then they just dispappeared.... not sure if the queen died/colony died out or something happened. Just watch out for it in spring.