Check with a farm or tractor store if there are any around you or look in the yellow pages for a name brand like Shell,Mobil, ect lubricant distributor and usually they carry solvents. Even NAPA sells solvents. The Exxon version of the low-odor, low-flash solvent is called Varsol; there are other similar products known as "Stoddard solvent".
In California, though, you may be forced to bow to the eco-nazis.