Optional item: a small electric drill (preferably rotating at a low speed, so it is easy to damage the disc. If not, replace it with a toy motor of more than 3W), a pair of 5×20mm flat-headed machine screws and matching nuts, two 30mm metal washers (with an inner diameter of 6mm) and some silk. Then put the CD on the mat, use toothpaste as abrasive, and polish it on the data surface of the CD with absorbent cotton or silk dipped in toothpaste. After grinding, the surface of the optical disc looks like a layer of fog, which has the greatest influence on the data reading of the optical disc. Therefore, the disc after grinding is "basically scrapped", but don't be nervous. As the saying goes, everything has its vanquisher, and there is also a magic weapon-colorless shoe polish. Apply colorless shoe polish to the fog with clean absorbent cotton, and then wipe off the shoe polish with clean absorbent cotton ... Has the fog been eliminated? Now your CD can take off again!
The effect is good, but it takes a lot of effort. One or two discs will do. Wouldn't it be tiring if there were too many discs? Don't worry, you can use a hand drill to help polish at this time. Clamp two metal gaskets with 8mm thick silk cloth, fasten them with screws, and cut the silk cloth into a grinding disc with a diameter greater than 2mm of the gasket, as shown in figure 1. This self-made polishing wheel can be used by clamping it on a hand drill. It should be noted that the polishing direction must be along the radial direction of the optical disc.