Professionals use various techniques to remove hard scratches from glass. One common method is to use a polishing compound specifically designed for glass scratch removal. This compound contains abrasive particles that help to smooth out the scratched surface. Professionals apply the compound to the scratched area and use a rotary buffer or polishing machine to work it into the glass. They continue buffing until the scratch is significantly reduced or completely eliminated. Another professional approach is to use diamond polishing pads, which are highly effective for removing deep scratches. These pads come in different grit levels and are used sequentially in a polishing process. It’s important to note that professional glass scratch removal may require specialized equipment and expertise.