Hi, can anybody advise on the best method of removing a stain caused by the discharge of my central heating system pipe down an exterior shingle wall ? It looks unsightly like rust !
Oxalic is great for removing rust stains and isn't expensive if you buy the crystals and make up your own solution. 2.5kg for less than £15 from fleabay. Mix some up with warm water to dissolve crystals and brush on - leave for a few hours and then wash off
Download the MSDS sheet, read it and exercise suitable care.
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