I have had a corian worktop and sink for a year. No issues with the worktop - I find it easy to clean and it’s in perfect condition. The sink, however, is difficult to keep clean. It stains easily and never looks completely pristine. Worse, I have noticed a couple of very small chips in the bottom of it - which is odd - presumably by metal cutlery or something being dropped, although I am pretty careful with it. Has anyone had similar experiences? Is this usual or did I get a dud sink?