The rust remover worked. All bits that were soaking over night are rust free. Although I have made a mistake by not thoroughly cleaning everything before sinking it. Some parts were covered with hardened dirt and the rust remover only hardened even more. I do not think I will be able to lean those parts properly. I put new bits in and will check them tomorrow.
After lunch (which was at grandpa’s again) I went to the river. I swam and read. The book I am reading now is Mystery by Peter Straub. It is the second part of a trilogy. I have read the first book last year, but my library only had that book and not the remaining two. And I still do not have the last one. I ordered all three of them in a bookshop but for some reason they could not get the last one (even though I found one fir sale online in no time).