Thanks for sharing your experience and thoughts on my Magic Erasers. Because my Quality Team works so efficiently, I’m confident every one of them is at the top standard everyone expects. It may help to know this product is designed to compress and break down as it'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. You’ll get the best results by wetting the pad with water before you use it, then gently squeezing out excess water. Do not wring or twist the excess out. Also, don’t add any cleaning products to it. After use, rinse the product and leave it to dry naturally. If you need something with a bit more strength, I'd like to tell you about my Extra Durable Magic Erasers. Give us a call any Monday through Friday, from 9 AM to 6 PM, EST, for more assistance. My number is 1 (800) 867-2532.