What about a net or cover and then clean it off ? Never heard of any way to discourage birds I am always encouraging them ..
For some reason I am only seeing this now. The problem has passed, it is only during the nesting season, but I wish they wouldn't use my pool as their waste dump. It is more the cement around the pool, than the water.
I don't know what a grackle looks like but I like the sound of it...send them off to me I love birds they are part of my life waste and all ...
They are like a small crow, and noisy. I like birds also, just not their waste.haha
I know what you mean ....are they all year round birds or do you get a respite ?
No, they aren't year round. They come in April and build their nests using the pine needles on the ground. Maybe that is my solution...rake up those needles, then they will build elsewhere.They are gone in July.
Now that sounds like a good idea ...mind you they are not there for long .me I would be photographing them making their nests ...but hey thats me ..