What to use to clean headstone?

To clean a headstone, use a soft brush or a cloth with mild soap and water. Avoid harsh chemicals or abrasive materials, as they can damage the stone. For granite headstones, a mixture of water and a few drops of dish soap works well, while for marble or limestone, it's best to use just water and a soft brush. Rinse thoroughly with clean water after cleaning to remove any soap residue.