Rust? Red Algae in Bird Bath?

Spokane, WA(Zone 5b)

So today I scrubbed and I scrubbed and I scrubbed to get either red algae or rust off the inside of the bowl of my bird bath........ I used comet, then Bar Tenders Friend,and there is still a little left. It is made of concrete, so not sure what else I could try????? The birds have scoffed at it this year, lol. I got most of it off, but there is still a little red there....... Any suggestions anyone?

This thread has 16 replies. This forum is accessible only to subscribing members of Dave's Garden. There are many free features here, and about half of our forums are completely open to all members. And learn more about Dave's Garden, and explore the benefits of becoming a subscribing member.

Want to join? Register here. Already signed up? Click here to login!