vinegar is great for cleaning an iron. I let my steam iron sit overnight with vinegar in the 'well', and the next morning, I started steaming with it and then dumped out the remainder of the vinegar, and then filled the well with water (filtered water) and let it steam away until I no longer smelled the vinegar. Then dump that out and fill again. I've not had any more problems. Perhaps vinegar will clean the scorched part off the bottom. I assume that's where the scorch is located.