While cleaning out a central heating radiator, I managed to spill some of the contents on some paving stones in the garden. Any suggestions as to what I could use to clean the mess? The stains are from the black sludge rather than the red stuff. Thanks for any help.
although acids will attack the iron oxide (magnetite) sediment, they will also attack the concrete (you use acids to clean off cement stains from brickwork)
Start by giving it a good scrub
the black stains are usually permanent and have probably soaked into the porous surface.
Maybe if we get a chemist on here he will know what might change the oxide into a material you can remove.
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