Flock Free

I didn't dislike anything because it works. It is safe for the birds. It just moves them to another place to do their business.

Hard reach without a ladder in tall trees. Should offer a distance sprayer.

Do not know if it is effective. Doves and swallows are still around the sprayed spots

worked initially for a couple of days to deter the birds trying to build a nest over my front door but even though the area was generously sprayed several times daily it quickly no longer had any effectiveness as a deterrent. also using the reflective streamers with the same results. I apparently have a pair of very determined birds because I have been knocking down all nest building attempts for weeks and they have not stopped yet. I have had other birds attempt on occasion but would quickly move on after removing their partially built nests a time or two but this little pair of birds just refuse to go.