Shaws fireclay sinks are strong sinks with a hard stain- and scratch-resistant surface. The materials for these sinks is fired at a very high temperature, creating the durable, glossy and nonporous surface. Unlike enameled sinks, the glaze on fireclay is an inseparable part of the sink, rather than a coating. This hard glaze means fireclay can generally withstand much more abuse than porcelain enameled cast iron. Fireclay can be cleaned with regular cleaners--many can even handle mildly abrasive cleaners, although Shaws recommends nonabrasive cleaners for everyday cleaning.
Fill the sink 1/4 of the way full of hot water. Add a few drops of liquid soap to a damp sponge.
Put on rubber gloves to protect your hands from the hot water and cleaner. Scrub the bottom and sides of the sink with a soft sponge. Add more soap if the grime is difficult to remove.
Clean soap scum or oily spots on the sink with baking soda. Simply sprinkle baking soda on your wet sponge and scrub. Baking soda is just abrasive enough to loosen material stuck to the sink, but not abrasive enough to harm it.
Rinse the sink clean of all cleaning products. Wipe it down afterward to dry it and make it look polished.