When we first moved into our home, I noticed an ugly, wrought iron bird bath outside our bedroom window. I planned to put in the trash but it was incredibly heavy. So I waited and then it rained. Birds flocked to that bird bath to drink, bath and socialize.
So we bought a wire brush and cleaned it as best we could. We also change the water every few days. Dozens of birds come every day. I love to watch the mockingbird skid in for a crash landing and then happily splash away. At night two doves sit on the rim of the bird bath with just their tales dipped into the water. They look as if they are watching the sunset.
My husband and I now realize that bird bath is sometimes the only safe water source those birds have. So I've learned my lesson. When I'm thinking about throwing something out, I wait a bit -- just in case.