You can use lacquer thinner as a degreaser.
Just like mineral spirits, lacquer thinner can also be used to remove tar and grease. A good number of motorists use this solvent to remove tar from their car paint.
What can dissolve tar?
Soak a rag with either mineral spirits or kerosene and rub off the tar that remains. They are solvents that easily dissolve tar, but they give off dangerous fumes, so wear a respirator and keep the windows open while using them.
Will thinners remove tar?
Any type of petroleum distillate will work in dissolving tar so you can use kerosene, diesel, mineral spirits, turps, xylene, paint thinner...etc.