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Thanks, unfortunately it’s predominantly black algae☹️

Thanks for the advice, the wife’s a chemist so I would get an ear pounding if I went near the stuff without proper breathing kit and PPE!  I intend using DDAC ( didecyl dimethyl ammonium chloride) once clean to keep the algae and mould down but it’s proving difficult to get at the moment as it...

Pease excuse my ignorance but is that 2xhypo 1x water or the other way? Do you add any agent to stop it running off the walls too quickly like washing liquid etc.... cheers, John