Cleaning engraved slate coasters requires a gentle approach to preserve both the slate and the engraving. Here are the best practices:

• Initial Dusting: Use a soft, dry cloth or a microfiber cloth to gently remove any dust or debris from the surface of the coasters.
• Warm Soapy Water: Mix a small amount of mild dish soap with warm water. Dampen a cloth in the solution and wipe the surface of the coasters carefully.
• Avoid Abrasives: Do not use scrub brushes, steel wool, or abrasive cleaners, as these can scratch the slate and damage the engraving.
• Rinse Thoroughly: After cleaning with soapy water, wipe the coasters with a clean damp cloth to remove any soap residue.
• Dry Properly: Use a soft dry cloth to thoroughly dry the coasters. Allow them to air dry completely before storing or using.
• Infrequent Deep Cleaning: For tough stains, use a mixture of baking soda and water to form a paste, apply it gently, and then rinse and dry.

By following these practices, you can keep your engraved slate coasters looking great for years to come.