The company was Persistent to Get rid of my spider problem that I had for years before hiring vikingThey came back as many times as needed till there was no more signs of spiders Then they called me to make sure they didn't need to come back again My technician was very patient and Extremely meticulous To get all the nooks and crannies were spiders might lay their eggs So I had no further investigation. If you have this problem you must call Viking.