Blackspot on Indian Sandstone

Murty | 14:56 Fri 24th Apr 2009 | Home & Garden

2 Answers

I laid a large area of patio with Indian Sandstone. After a couple of years blackspot began to appear. Now it has spread to almost all the flags. I've used sandstone cleaner, bleach and stone & brick cleaner and got no result. Is there any remedy for this or is it a bacteria embedded.
Please someone help as my patio now looks old and decrepid.

Stardrops.

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nonomaybe

Do any of the remedies that you have tried involve taking off the surface (fractionally) as in scouring or sandblasting? If not I would consider doing just that and after having cleaned it, not too perfectly (give a bit of character!) seal it.

Murty

Question Author

Thanks 4 dat - makes sense to me - worth a go alright.

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