Clean the surface of the glass on top and around the gilding with a dish towel that has been soaked in soapy water. This will remove any dust, dirt or grime on the surface.
Scrape off the majority of the gilding with a sharp razor blade. Avoid using a heavy hand when removing the gilding as this will leave scratches in the glass.
Wipe away any loose gilding from the glass with a soapy dish towel.
Allow the glass to dry and examine it for any remaining gilding, as there may still be gold leaf in smaller decorative areas.
Wet a cotton swab with acetone and rub off any remaining gilding, including any that is in crevices or cracks.
Wash the glass off with a soapy dish towel to remove the acetone.