We had a spider about 5 cm in size in our house today. Despite being sprayed for a good 30 seconds at close range, the spider made no effort to move away or die. Even after 3 hours, it was still sitting in the same place. Unfortunately, a spray that only works after half a day is of little use to me in acute cases. In the meantime, they can run around everywhere. Our conclusion: The spray does not work, at least not within a short time and not for the immigrant species that have recently (even in November) populated our balcony.