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White spotting on block paving


Jamespf1

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Hi all, 

On a 2 day job and have come across white spotting on block having. Put a 7% hypo mix on it and so far I can’t see any change. 
Anyone know how to shift this?

Thanks 

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5 hours ago, Jamespf1 said:

Hi all, 

On a 2 day job and have come across white spotting on block having. Put a 7% hypo mix on it and so far I can’t see any change. 
Anyone know how to shift this?

Thanks 

Depending what it is neat hypo on just the bits like this and a rub with a stiff brush then leave it for  20-30 muinits scrub and rinse might help 

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