spark plug cleaner...?

The spark plug cleaner works well to clean the plug. In order to make used plugs work best the center electrode should still have sharp edges. During my days of attending college, I would clean the plugs, file the center electrode so that it was flat, perpendicular to the vertical axis, and had sharp edges, then gap them. It took some time depending on the condition of the plugs.
Ever since graduating and being employed I only clean them if they are dirty and replace them if they need to be filed.