Miss K received a magic book for Easter. The one where you use a special marker and the pictures appear. I decided that would be great to talk with us on Sundays except that the marker if it gets on clothing leaves a mark. I looked on the website and they said to use a rust remover that you can buy in the supermarket. That might work if you lived in America and had various kinds and brands of stain removers. I looked in a few supermarkets. There were various things from the UK, Japan and Australia but nothing that said removes rust. I tried baking soda because that will remove rust from some surfaces. That did nothing.
Someone on a forum suggested cream of tartar and sun. I had to wait a few days for the sun but I tried it and guess what -- it took the spots out. I am thrilled. That is a household hint to remember.