Hi again. I have several safe plaques that have blue /green corrosion happening to them. Is there anything that will dissolve or break down without affecting the brass or patination? Can this corrosion pass on to other plaques it comes into contact with? I've noticed some plaques that have contact with others seem to have affected each other. I have had a look on the net for information but things seem to conflict each other and i dont want to cause any damage. Most of my plaques have had paint on at some time which i have removed so the majority do not have the original patination so having to clean overall would not be the end of the world but I thought if something was able to dissolve it would save a lot of work. Thanks once again for any help you guys can give. Respect.