I called Arterix on a Saturday about a new colony of yellow jackets that established in an exterior wall of my townhome, where masonry meets cedar siding. Jamshed, the technician, arrived on Monday afternoon. The treatment worked immediately that day and Jamshed returned two weeks later for a second go-around, just in case. My communications with Art, the owner, Nataliia in the office, and Jamshed were all excellent. I highly recommend Arterix.