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I've used spray and leave which IW are selling today at £24.99 for 5L but there's a fiver postage on top. This does work but remember it doesn't really work on dirt, only green slime and algae. I do recall Anne Dorrington saying wet and forget will work on black mould but it could take months. To be honest I got just as good results with a wire head brush and hot soapy water but it's a lot harder work.CC
I've used spray and leave which IW are selling today at £24.99 for 5L but there's a fiver postage on top. This does work but remember it doesn't really work on dirt, only green slime and algae. I do recall Anne Dorrington saying wet and forget will work on black mould but it could take months. To be honest I got just as good results with a wire head brush and hot soapy water but it's a lot harder work.
CC