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Started by: ena malcup (4151)
Have you tried heat?
One of those hot air guns used for paint stripping, or butane weed-burning device. (they also come in electric versions)
Should kill the algae, though you will still need to clean away the remnant/stain.
The thickening agent in bleach probably causes immediate reinfestation.
Replied: 2nd May 2022 at 15:33