Since onyx absorbs liquids quickly, it is important to wipe up spills immediately to prevent damage to countertops. Acidic liquids such as vinegar, wine or fruit juice may leave permanent marks even with attentive cleanup.
Sealing onyx countertops with food-resistant sealant can help prevent stains, dulling and etching from occurring. The sealant should be applied after installation and before use, by a countertop installation professional.
To clean, wipe onyx countertops using a soft cloth. Use non-acidic cleaning products to remove dirt and increase shine. Do not spray cleaner directly onto the countertop. Spray onto the dry cloth instead, to prevent the stone from absorbing the cleaner, which could cause permanent damage. Wipe away any excess cleaner immediately.
Onyx is translucent, which means the stone lets in more light than other natural stone products. While this can create a luminous effect, you will have difficulty hiding strains and scratches.
Natural cleaning products or those recommended by the manufacturer are best for cleaning onyx.
Use a cutting board when preparing meals on an onyx countertop. Like marble or serpentine surfaces, onyx scratches easily. These scratches are usually permanent and cannot be buffed or polished away.
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