Share
Sandstone pool tiles have black in the tiles
Hi @vicki62
Looks like a little mold in the sandstone recesses. If you have a steam cleaner I would try that as a non chemical approach first as the heat will kill most spores and also help clean deeper into the stone with out hurting it.
You could also use a pressure washer just dont aim to close to the sand stone as the stone can be damaged.
Regular mould cleaned come to mind after that exit mould being the strongest and smellest I might use last of all.
But there is another product that might be a better more mild approach I havnt tried before
Monarch 3L Sugar Soap with Mould Remover I/N: 0076996 $13
Any new cleaning product you use always try in an out of the way spot in case it dosnt have the desired results.
I would use a broom to apply to the stone.
Wash off with a hose on jet nozzle.
Hope this helps clean that nice stone of yours 
Welcome to the Bunnings Workshop community @vicki62. It's brilliant to have you join us, and many thanks for your question about cleaning pavers.
What type of cleaning methods have you tried so far? You might like to apply a cleaner like 30 Seconds 5L Outdoor Cleaner With Power Sprayer. I'd suggest you then use a stiff bristle broom to scrub the area down and really get down into those crevices where the discolouration has occurred. As mentioned, do a test section first to ensure the product does not reach with your paver sealer. Remember to follow the PPE directions on the product.
Some great suggestions from @Jewelleryrescue there, too.
Please let me know if you have any questions and how you go.
Mitchell
