There is no such thing as a permanent product.

After cleaning the feces and nest, the effect will continue for 2 years or longer when the Sairen is installed.

In our installation experience, there are also sites where pigeons do not come back after three to four years.

If the pigeons come back again, after 2 to 3 years after installing the bird repellent, they are the pigeons that have not yet learned the conventional visual / tactile / olfactory inconvenience of the product and are coming to the scene.