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A number of years ago we were at a natural hot springs and the owners there were using a power washer to "clean" the sides of the pool....underwater. It worked like a charm. This trick would work in a bird bath too as it would be easy to flush the debris out with a garden hose...or the power washer itself.
I never thought of using in the birdbath because I didn't want it to hurt the birds. I guess if you rinse it enough the birdbath will be OK no matter what is used.