We&#39;re so glad you&#39;re a fan of our Magic Eraser, Lee! The eraser is designed to compress and break down as it&#39;s used, like a pencil eraser. It can leave behind small pieces of residue, just as a pencil eraser does. How long the product lasts depends on how many times you use it and how rough the surfaces you use it on are. For best results, wet the pad with water before you use it. Then squeeze out excess water rather than wringing or twisting the pad. Don&#39;t use any cleaning product with the pad. After use, rinse the product and leave it to dry naturally. Please know thought that our products go through many quality checks to make sure they reach you in excellent condition. To share more or if we can help you with anything else, please call us at (800) 248-1612.<br /><br />-The Mr. Clean Team