The specks on the lid is likely from dust or pollen that got baked on. I've seen that on some of the used Kettles I've gotten. If you have a brass brush, you can use that without scratching the paint. Alternatively, get the lid wet, sprinkle some baking soda and scrub using scotch-brite (I use the less abrasive blue one). The baking soda acts as a mild abrasive. I use this method on a lot of things (pots, pans, stove top, enamel and SS parts of the grill, etc.) as well. It works like a charm.