Glass cooktops can be cleaned like a professional with a few simple steps. First, gather the necessary supplies, including a glass cooktop cleaner, a non-scratch sponge, and a microfiber cloth. Begin by wiping away any loose debris with the sponge. Then, apply the glass cooktop cleaner and gently scrub in a circular motion. Rinse the cooktop with water and wipe it dry with the microfiber cloth. Repeat these steps as necessary to achieve a sparkling clean glass cooktop.