The best you can do is to get the fine scratches running all the same way. I have had some success with diamond grit paste on a polishing mop. but the same still applies. I have a friend who works in the stainless steel fabricating industry and they use a diminishing series of carborundum grit and wax to achieve a mirror finish. The amount of wax in the final finish is the reason it is sometimes difficult to get cermark to adhere properly.