Quote:
Originally Posted by Gate Keeper
Morning all, does anyone know how to remove lime wash from flagstones? The builders left some on our stones and it is a devil to get off. I have tried using a wire brush with soapy water and no luck. Yesterday they plastered the walls and screed the floor.
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Lime wash is alkaline so you need something acidic to remove it. Soapy water is usually (weakly) alkaline so, as you've found out, doesn't work
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Can you get hold of some "Brick acid"
https://www.chemicals.co.uk/blog/what-is-brick-acid
Be very, very careful with it - it will burn skin and destroy eyes. Start with it well diluted just in case it reacts with the flagstones themselves. In those famous words- try on an inconspicuous area first.
Hope that helps.
Good Luck.