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I clean my concrete bird bath just by scrubbing with a brush to get all the algae off, then run clean water to rinse, empty it, and then refill. It works fine.
If it needed bleach, I would dilute the bleach and let it sit for about 15 minutes, then rinse very, very well before refilling, but I've never needed anything more than a good scrubbing with a brush.
This is what I did, the birds were at it when it was filthy and still like it clean...for a while they were absent and I worried that I ruined it for them :-)
Just scrub with a brush and rinse well. You can use a bit of bleach because the chlorine will just evaporate in a couple of hours, so let it dry and the bleach will go, but I'd just scrub it.
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