One point to remember, especially on older coins is"a bad apple spoils the bunch". Steel cents lose their zinc coating, this has then over the years exposed them to the elements. Acetone remo removes organic substances only. Bronze disease, rust, oxidations are all enemies, and can effect one coin to another. Separate out problem coins from damaging others in a long time storage mode. The newer coins as the 2017's may seem OK, but if minute "split plating" has occurred, the zinc core has become exposed to air and other contaminants. They may be OK in storage if sealed properly and placed in a low humidity environment(in a controlled safe, etc). But do separate the problems, once rust has started, it usually isn't inhibited entirely, same as "bronze disease", those need to be discarded or placed contained, by themselves.