Not just turpentine also if your going to clean the metal use STAINLESS STEEL WOOL not sandpaper or steel wool as both will affect the finish by removing it faster than you can rip your strides down finding the dunny door locked.
Method - Give the stainless steel wool a good drink of WD40 or RP-7 and just buff the steel parts with it wipe off then re oil with balistol of gun oil it will look a million dollars the stainless steel wool trick was shown to me by a WWII Armourer.