If you buy magic eraser pads in the supermarket they are not very durable, magic eraser pads are sold in kg per cubic meter the ones you find in the supermarket are usually about 7 to 8 kg per cubic meter, ask your janitorial supplier for 11kg per cubic meter pads as these are very durable, nothing will deep clean glass like these type pads, we are waiting on samples of 17kg per cubic meter pads from our supplier in Korea and these will be extremely durable for deep cleaning hard surfaces.