Pigeons had set up home in a particular area of our house nesting, roosting and crapping everywhere. Tried a few potential solutions ,nothing worked until a friend put us in contact with a guy who specialises  in fixing exactly those problems.

 

Options are gel, spray, netting and spikes. Our solution was netting (almost invisible) and spikes on a couple of ledges where they roosted.

 

Two weeks now and they are gone, nor more birdcr-p!  Professionally done, 5,000baht well spent imo.

 

Cannot post here but if you have similar problems and would like to resolve them send a pm  and I will pass on the details

Same here!! We spent a fortune putting those spikes everywhere, put the sticky gel in places, even bought a ultrasonic speaker than is supposed to scare them away. Even trained my dogs to bark incessantly at them if they land on the roof. NOTHING helped. Finally found someone to put up a black netting in their hangouts and that took care of 95% of them. They still try to roost in the gutters on occasion, we may eventually have to put nets over them as well.

Get a plastic owl or hawk - done