Orange Marks On Raised Border Coping Stones

We have several raised borders all of which seem to be suffering rather UN-sightly orange marks on the coping slabs. Sunshine appears to reduce it slightly but we are wondering what it is and how best we can clean it off. Can anybody help ?

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1 Comment To "Orange Marks On Raised Border Coping Stones"

#1 Comment By BushDoctor On 11/02/2020 @ 9:47 am

This is an actual case of rust! This happens when there is a high iron content in, either, the stones, or the water or soil touching them.

From here, it is advised to use soap and water to avoid damaging the concrete. If that doesn't work, then citric acid can. Just be cautious with this, since it can corrode the concrete if used in excess.

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