If you’ve got a spot of dust under your PanzerGlass, then gently lift the glass and then use the supplied tape “Vacuum Membrane”. If you do not have the tape, then regular clear tape can also be used. You use the tape on the dust particle and then pull the tape off and the dust particle will be removed. In this process you should be very careful not to get fingers on the sticky side of the glass, or get more dust on the glass.
Watch this video about how to remove dust: