Plexiglas windscreen cleaner that will remove small scratches. I have never done this, so do so at your own risk. Preventing Cracks Cracking of the turntable dustcover is a problem that needn't show up with proper care. Here are a few tips to prevent this from happening to you. Periodically check the dustcover to make sure that it is installed correctly with each side equally and snugly fit into the channel at the rear of the turntable.
Uneven torque can cause cracking.
If you open the turntable by handling the same side each time eventually the other side will loosen up and you will have a case of uneven torque. Open the dustcover by grasping both sides. Put the dustcover down when you are finished using the turntable. This relieves the torque on the dustcover and keeps dust off of your turntable. If you have the type of dustcover that is easily removed, you may want to consider removing it during use.