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Last time I cleaned my aircon, I bought an antibacterial aerosol (from a pound shop, although it was a proper brand (Dettol or similar)). Put the fans on full and spray half the can into the air intakes. Turn the fans off and leave for a hour or so. Open the windows and let the stuff dissipate as I'm not sure how good for you breathing stuff like that is.
The smell I had was more pond than fish but it went and never came back.
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