Because Corian is a renewable surface, scratches are only temporary. The material is the same below the surface, so buffing removes minor cuts. After a little rubbing and polishing, the surface will appear nearly new. All Corian counters attain a soft patina over time. It's normal for the finish to mutate somewhat as time passes, but a deep cleaning will restore its original appearance. Cleaning removes haziness while buffing removes minor scratches, stains and burn marks.
Wash the scratches on the Corian counters with a mild abrasive cleaner and cleaning cloth. While the area is still wet, buff gently for one minute using the peach pad from a solid-surface repair kit. Buff the scratches in one direction only; do not rub in a circular motion. Rinse the pad with water as needed.
Rinse the scratches with water and dry with a flannel cloth. Confirm that they have disappeared, blending with the rest of the counters. If they have not, use the reverse side of the peach pad and continue buffing for another minute or until the scratches are gone.
Buff with the aqua pad from the kit once the scratches have been completely removed. Buff in a straight line at a 90-degree angle from the direction you buffed with the peach pad. If the area appears blended, you are done.
Use the grey pad from the kit if you prefer a glossier finish. Buff in a straight line at a 90-degree angle from your previous buffing direction. Clean the pads and allow them to air-dry.
Solid-surface repair kits are available online and work for either matt or high-gloss Corian counters. The manufacturer of Corian suggests abrasive pads from Micro-Surface Finishing Products, Inc. Each kit contains abrasive pads in various colours; each colour represents a different grit or grade. The pads are washable and reusable. If the scratches don't blend with the surrounding surface, expand your buffing area. Buff several inches beyond the scratches.
Buffing too hard will create worse scratches.