Today I completed your one time service. It was good talking with you today. I first started by looking around the outside for the hole that the Yellowjackets are going in to. The hole on the exterior is at the top of the push out part of where the closet is. I sealed up a hole in the closet to prevent them from getting inside. I then treated the exterior hole with a liquid residual to help prevent Yellowjacket activity. Please allow this treatment to take two weeks for full effect as it will agitate insects. Please contact us with any questions or concerns. Thank you for choosing Green Pest Solutions have a great day.