Sealants help protect your onyx surfaces from stains, scratches, and etching caused by acids. Look for a sealant designed for stone countertops, such as Miracle Sealant or Aqua Mix.
A microfiber cloth or other fine, soft cloth is ideal.
If the dirt is particularly hard to remove, you can use a slightly damp brush, but be sure to blot the stone dry afterwards.
Never wear onyx jewelry when swimming, bathing, or using household cleaners that may damage the stone.
