Unfortunately, this product did not work at all in deterring house sparrows from roosting on our house roof and under the verandahs.
Unfortunately, in my situation, the D-Ter product had no effect at all. Every day, house sparrows perch under the verandahs of our house and on the roof under the gables, fouling the roof, which is where our drinking water comes from and the verandahs. I sprayed the whole area with the D-Ter product, using the recommended rate and it has had absolutely no effect on the sparrows whatsoever, they are back everyday as thick as ever.
I will try again with the product but should have worked the first time.... I certainly was not expecting to have to apply 3 times.
Have used the product twice in 10 days and I am still struggling to get rid of the birds in my shed. I have resorted to the bird alarm that is very noisy!