Cleaning Indian sandstone is simple. Use soapy water, or, for tougher stains as well as moss and algae, a bleach mixture. Combine equal parts of bleach and water and pour onto the slabs. Leave for around 30 minutes and wash off with a stiff brush, power washer or a hose to ensure you've got rid of all the bleach.. Add equal parts water and equal parts household bleach into a container and drench your entire sandstone surface with the bleach solution. Next, ensure to work the bleach onto every part of the Indian sandstone surface, specifically targeting the black spots. Leave the area for 15 minutes for the bleach to soak in and take effect.

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Mix a paste in a bowl using one part baking soda, one part white vinegar and one part hot water.'. 3. Apply your cleaner. (Image credit: Topps Tiles) Next, apply your chosen cleaning agent to your patio. Be generous; the more solution you apply, the more likely those black spots are to lift.. Here are six simple steps to cleaning Indian sandstone with warm, soapy water: Mix washing-up liquid with warm water in a bucket. Pour mixture over the Indian sandstone slabs. Thoroughly clean area with a hard bristled brush. Rinse with clean water. Leave for 24 hours. If the area is still dirty, repeat the process.