It is common stoddard solvent. It can be bought in 5 gal cans to bulk from your local bulk oil distributor. It is a less filtered form of charcoal lighter.
I used to work for an oil company. Worked with the stuff for years. Although there are a lot of products out there that are modified ( to prevent excessive drying of skin to raising the flashpoint )
Remember this stuff has a flash of 140 degrees so ALWAYS be aware that you are using lighter fluid.
Hope this helps.
Jim