From the Corian website ...
Removing fine scratches or a blotchy appearance
You may notice that the surface of your countertop begins to look blotchy. Typically, this is caused by leaving hard water to dry on the surface which will leave a film of minerals. To remove this film:
Pour some mild abrasive liquid cleanser, such as Soft Scrub®, on a damp sponge or cloth and rub over area using small circular motions, from the front to the back, then side to side, overlapping the circles until the entire area has been cleaned.
Thoroughly rinse the top with clean water and WIPE SURFACE COMPLETELY DRY.
Check to see if blotchiness is gone. If not, repeat procedure applying more pressure on the sponge or rag.
Continue over all affected areas until all film is removed.
NOTE: While this procedure may remove or minimize the look of very fine scratches, other deeper scratches may remain. They may be removed by following the procedure below or you may with to hire a professional refinisher to refinish your countertop. Contact your Corian® Retailer or DuPont to arrange for professional refinishing.
Removing minor cuts and scratches*
Because the solid beauty of Corian® goes all the way through, Corian® surfaces are renewable. You can remove minor cuts and scratches yourself by following these instructions.
First, wash the area where the scratch is located, following the instructions found in this guide, to remove any film on the surface as this film may clog the abrasive pads. With this surface still wet, start rubbing with the Peach colored side of the cleaning pad. Use a light touch. Pressing too hard may actually leave deeper scratches. Rub over the scratch using a straight line motion. Periodically switch rubbing direction ninety degrees. Rinse pad periodically during this process to remove any built up residue. Be sure all of the scratch is removed.
Clean top with water and dry thoroughly. Check to see if sanded area blends with rest of top. Please note that sanded area may not perfectly match remainder of top. If necessary, turn pad over and repeat process. Rub over large area to blend in sanding.
If needed, continue the sanding process using the Aqua colored pad and if necessary, the Gray colored pad until the desired gloss level is achieved.
Rinse out all pads used and allow them to air dry before putting them away.
An alternative to your refinishing your countertop, is to contact your Corian® retailer or DuPont to arrange for professional refinishing.
Sources for materials mentioned above:
Abrasive pads
Micro-Surface Finishing Products, Inc.
(800) 225-3006
Countertop Magic®
Magic America Corp.
(800) 321-6330
Clean EnCounters®
SCI (800) 839-1654 or The Home Depot
Deep Cleaner for DuPont Corian®
SCI (800) 839-1654 or The Home Depot
Enhance Countertop Polish
EMS – (800) 643-8818
Green Scotch-Brite®
Local supermarket or hardware store
Hope’s Countertop Polish
The Hope Co. (800) 325-4026
SoftScrub®
Local supermarket
