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Hi all, We rendered a new build in white sand and cement - when there is no rain it looks good - then the rain comes and it looks patchy and dirty looking all over. Does anyone know what likely cause is and if it can be easily cleaned or what needs sorting (bit mind boggling given it looks fine...

Hi @Paul6724 I have a similar issue - nice and white when it dried out and then when it rains walls going dirty looking. Can you advise what I need to do? Was using white sand and cement render from Kilsaran.