Varsol is a cleaning solvent used in the printing industry to dissolve printing inks used in offset lithography (printing). It works very well to dissolve hardened petroleum and organic greases. I used to use it to dissolve the hardened grease that Apple used in their sony oem'ed disc drive mechanisms.
It works almost a well as CFC based cleaners. It is a cleaner/solvent made from a kerosene derivitive and some other unknown materials that presumably fell to earth
.
What is nice is that it will dissolve old grease with no effort, and dry to leave no residue, without giving the user a buzz.