[Radioroslyn]

I had a similar issue with a Crosley Trirdyne lid. Has several black spots and was able to get them out by bleaching. Unfortunately I don't remember what I used for bleach. If I had to guess I think it was just regular laundry bleach. Kirk could answer as to what I used. Worker well. Just apply just on the areas you want to lighten not over the whole top. On the darker borders of the stain use a qtip or small brush. You want to keep the bleach contained just the stain and the darker the stain area the more bleach and time it will take. A little bit goes a long way so take your time. https://www.flickr.com/photos/53710524@N06/11198613343/ https://www.flickr.com/photos/53710524@N06/11198452535/
Hope this helps.