Wipe the Corian sink regularly with a damp cleaning rag to remove loose buildup.
Fill the sink with a few inches of warm, soapy dish water. Dip a clean rag into the soapy water and scrub the Corian to remove food residue and tough buildup. Rinse the sink and wipe with a clean, dry rag.
Spray the sink with an ammonia-based cleaning solution for extremely tough residue. Scrub the sink with a clean, damp rag and rinse the sink well when finished to remove any leftover traces of ammonia. Avoid window cleaners with ammonia content as these often leave behind waxy residue.