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Bought a few dozen degreaser on screwfix sale at £5.99. I tried it with hot water and the mildew came off easy. Did like the vir-sol until it dried on me and turned everything yellow/orange colour. Sunny tomorrow, means if it dries on me it will stay white.
If you are getting plastic to go yellow yellow with virosol you are using it to strong we mix it 10-1 maximum strength never goes yellow most products will remove green algy from plastic we only use hypo on black algy that has been there for a long time as it will etch the plastic surface and turn it grey usualy the hypo will remove this , hypo on plastics is a last resort as far as Ime concerned