Q. I have a Dupont Corian sink that has a large, light green stain that I can’t seem to get rid of. I called the manufacturer and they suggested all types of cleaners which haven’t worked. I called back and they suggested someone may have to resand my sink, but the cost, $500, is quite expensive. At one time, I used well water but for the last nine years I’ve been using town water. I have to bleach the sink every night since anything stains the sink, the top stains disappear with bleach but the green stains remain. Do you have any ideas what I can do to rid myself of these green stains?
— MARION BIHARI, FALMOUTH MARION BIHARI, Falmouth