In order to eliminate slight scratches that may have accumulated over time and use on a piece of furniture with a transparent varnish or lacquer finish, you can use a polishing agent with a very soft cloth. It is important to choose a polishing agent that is appropriate for the original gloss of the varnish. Generally, a coarser polishing agent will result in a less shiny surface, while a finer one will result in a shinier surface. If scratches are still visible after polishing, you may need to sand the surface with wet or dry 800-grit sandpaper before polishing it again until it is completely de-polished.