Technically, yes, but should you? Probably not. "Bleach can help with deep stains, but over time, it weakens the protective glaze," explains Knoll. "If you do use it, dilute it with water and ...

“Stains can be quickly removed either with standard ... sinks made of cast iron or fireclay topped by a porcelain-enamel glaze, as well as for sinks molded from a variety of composite materials.

"Please avoid steel wool—this is the stuff that will remove that glaze I mentioned earlier," warns Knoll. Let it sit for 10–15 minutes for deeper stains. Rinse with warm water and wipe dry.