Nothing is more aggravating than cleaning up your yard furniture and coming out a few hours later to discover the birds have dive bombed and messed them up again. I had just washed all of our metal furniture and Andy resprayed all of it and in no time birds were back pooping all over it again. DISGUSTING!
We made a trip to Wal-Mart for some realistic looking rubber snakes and it has virtually stopped that problem. The secret to making it successful is you have to move them around periodically. You can't throw them out and forget them.