I forgot that you had mentioned rust remover until I reread your ealier post. What do you recommend? Abe mentioned Naval Jelly. Is that what you mean?
Here are my iron coins... should I do something or leave as is ? (Please note Paraguay is a tropical country, you can imagine the humidity)
I use something called Krud Kutter which is a rust remover and also acts as a protectant. Goossen, any iron coin I get I at least put rust preventer on...and since the rust preventer I use is also a rust remover...that helps.
I believe in trying to stop the rust. (Many don't it seems.) You can see from this thread I tried Break Free. (Somewhat similar to WD40.) I then think in a humid environment such as yours some kind coating would help prevent further rusting. Mineral oil perhaps. Doug and others have repeatedly warned of unexpected chemical reactions with any treatments. So I don't know!?