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Frankly, for home use, water and a scrub brush is probably your best option. Isopropyl alchohol (most any alchohol, really) can be used to kill algea (edit: actually, I suspect you are seeing cyanobacteria), however it precipitates proteins and DNA/RNA, leaving you wielding that scrub brush anyway.
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Why do you think it's a cyanobacteria?
I haven't read through the whole thread but why hasn't alcohol been working?