I don't work. I was up in the ladder putting on the wall a lot of the bird repellant, as the instructions says.. and after I applied it.. a couple of bird landed next were I was working. The repellant after a couple of days got full of dirt. You must image like silicone that grabs dirt, and after a couple of days in the sun it worn out.. but the stain of silicone and dirt still there and the stupid birds still land on my wall