I used plain ole K1 kerosine. It has several advantages. High flash point so it will not explode like gas. Slow burning so if it does ignite it wont go crazy. It does not evaporate fast so low amount of vapors and it will stick around long enough to really soak into the tar undercoating. It also washes up easy with a good soap and water solution. Not as toxic as some other distilates so vapors and skin contact are of less of a concern.
Naptha will also work well and is a little less oily. It just costs more.
I not only cleaned my engine bay, but also the entire under side of the car including the wheel areas then painted it.
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