You can make the shellac shine again if you are careful. I restore anitiques that oftem has cloudy shellac finish. Take clear shellac on a lint free cloth with a little linseed oil on the cloth as lubricant and rub the surface in a circular motion. This is called french polishing. Google and you will find how to do this. This usually done on furniture but can be adapted to machines. I use it on mine and it will reduce the grazying in the finish by filling in the cracks. It is a little more work after the cleaning but the results is good. Glenn