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How to stain stone
Clean the stone with a stiff wire brush.
Take a wire brush and thoroughly scrub the entire surface of your decorative stone. Pay special attention to any areas that are coated in dust or grime, or that have collected debris.
If you try staining the stone before it's been cleaned, you'll only end up staining the dirt on the stone, which will inevitably fall off. Rinse the interior stone off with a damp rag.