Bird spikes (plastic or aluminum) work very well, but with any cure it has its issues with collecting wind blow debris. There was a jell type product that became rubbery and can be installed from tubes to the areas that birds land on like silicone. It was called HOT FOOT, as it made it uncomfortable for birds to set on the areas covered without causing any health issues to the birds. Of course there was a life expectancy to the product and has to be replaced.
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