buyer/seller integrity question

Did you try the dish yellow sponge with green scrub pad side and put a good bit of Bar Keepers Friend power. Just damp the sponge 1st. I just had to clean a tub and crapper tgat had a build up of hard water stain. Cleaned it up to like new.
As far as the car I think he is setting you up. You put a price, he agreed. You put lots of pictures, and he should have done a personal inspection. Or paid someone too. And anyone who thinks a 60 year old car has zero wrong is crazy. There is always something. Even prep guys at new cat dealers find things.