In one sentence, describe what the following article is about:

Give your cookware several minutes to return to a normal temperature. If you submerge a hot pan in cold water, it may cause the material to permanently warp or bubble.  Always use warm or hot water to clean your Calphalon cookware. Exposing heated cookware to cold water against the manufacturer’s instructions may void your product warranty. Though Calphalon is scratch-resistant and made to take a beating, too much consistent wear and tear can render its nonstick finish ineffective. Avoid dropping, banging or being overly rough with your cookware. If you take care of it, it’s guaranteed to last you a long time.  Whenever possible, use plastic utensils instead of metal ones to prevent scratches.  Never attempt to cut ingredients while they’re inside the pan. If your cookware starts looking dull after repeated use, a product like Calphalon Dormond Cleanser or Bar Keepers Friend can restore the finish to its original condition. These types of cleansers are formulated specifically for use on stainless steel and other nonstick surfaces, and can be useful for renewing smoothness and shine. Nonstick cleansers and polishes can leave behind a powdery residue if they’re not rinsed away completely. Buffing can improve the appearance of pieces that have just begun to display tell-tale silvery scratch lines. Using a heavy-duty Scotch-Brite scrubbing pad, rub the area around the scratch with a light circular motion until the worst of the damage disappears. Afterwards, treat the piece with a special nonstick cleanser and rinse it thoroughly.  Rub along the grain of the pan to avoid causing further scratching or scuffing. Severely scratched cookware should be thrown out and replaced. When nonstick surfaces become damaged, it’s possible for them to release toxic chemicals that can leach into food.
Allow the cooking surface to cool before washing. Handle Calphalon with care. Polish pots and pans with a special cleanser. Buff out small scratches.