- 1). Scrub yellow marks with a non-scratching scrubbing pad and soapy water.
- 2). Rinse well and dry the cultured marble.
- 3). Apply a small amount of fiberglass cleaner with a soft cloth. Clean and shine the marble.
- 4). Inspect the surface after cleaning. If the marks still remain, there could be a problem with the coating and it may need to be replaced.
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