Can wd40 or something work? Don't try till sure - read metal + rust shoiuld be similer.
Worse case can a new rj45 be soldered?
What cam is it out of interest? Ive 3 ipcam 2in 1out foscam plan on setting with XPE someday
Ignore this man, .... RJ45 connections are not soldered in place - they are crimped.