I do not know much about paving. Just under 12 months ago we had Grey Indian Sandstone Patio laid - the weather was quite bad at the time so it took longer than expected to get the job completed - we noticed however that not long after completion a number of the slabs have a strange stain on them and appear to be discoloured. Would any body be able to help me identify the issue if I send a picture? And does anyone know the best way to try clean them up or would they be lost forever? The guy who laid them has not replied to any of our messages and seems to have just blanked us now
Thanks
Paul