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Thanks, I have tried acid and bleach [ not mixed] but it didn’t work. The problem is difference in colours : grey, dark buff, light buff, and some lemon! Even in one single slab there are different colours. I am looking for a way to colour them with the same material as the slabs and seal them...

Hi Last summer we used buff colour paving slabs for 100 square meter of the garden and bricks for the driveway. As the final work we covered the slabs and bricks with diluted cement to fill the gaps between them and protect them from movement and water. And washed it after one hour but it ended...