black marks on patio
Have got a big problem with my patio. It is pink coloured sandstone and is only 3 years old. It has cleaned up nicely with a power washer previously but this time I am left with black marks and spots all over it. I have bought some sandstone sealer to treat the tiles with when I can get them clean. I have tried bleach which has removed some of them but most still remain. My patio slopes very slightly so I cannot keep the bleach in place for any length of time. I am really concerned about damaging the stone with so much scrubbing and power washing but do not know what else to do. Any advice at all would be most welcome.
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You don't want to make matters worse.
There are specialized sandstone cleaning products.
There's a lot of info here-
http://www.pavingexpert.com/maintain_02.htm#acid
Wisdom is not putting it in a fruit salad.
Have you got a photo @susananwms ?
Some good info here:
http://www.pavingexpert.com/maintain_03.htm
I have to admit to not being bothered about eradicating the lichen off my paving, so leave it be.
Not much help to susananwms, sorry. But it is a sign of clean air supposedly😁.