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Most effective is a combination of attacks. I normally go with clean it with a soft cloth and washing up liquid, then descale it so there's no porous layer on the surface for the algae to live in, then sterilise it with Milton or similar bleachy sterilising tablets. If the plastic is right, you can then hit it with boiling water to both further sterilise and clear the bleachy smell. Algae will always come back eventually, but that will make sure it doesn't just happen again quickly.
Jonny69
aggi
I've got a plastic tank with some algae in it. What's the best way of cleaning the tank without damaging the plastic?