Natural stone comes in many varieties and each needs a tailored approach. Here's how different types of natural stone should be cleaned.
Natural stone is a broad category that includes Indian sandstone, limestone, slate, granite, and various local stone types. Each has different properties that affect how it should be cleaned. As a general rule, softer, more porous stones like sandstone and limestone need lower pressure and pH-neutral or specialist stone cleaners. Harder stones like granite and slate can tolerate more pressure.
Limestone is particularly sensitive to acidic cleaners — even mild ones. Using an inappropriate cleaner on limestone can etch the surface and cause permanent dulling. Always use a cleaner specifically formulated for limestone, or a neutral pH cleaner known to be safe for calcite-based stones. A professional will know which products are safe for your particular stone.
Slate patios are often used in gardens for their distinctive appearance but can become slippery when algae grows in their textured surface. Regular cleaning restores the natural texture and grip of the stone. After cleaning, a penetrating sealer helps repel water and reduces the rate of algae regrowth, extending the time between necessary professional cleans.
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