I used to use organic solvents (fuel, paint thinner, etc,) for cleaning greasy parts, put got concerned about absorbing too much of that through my skin, the flammability, and the smell (I often work in the basement).
I really like the water based commercial degreasers, especially the ones with lye, although, they will still dry out your hands if you don’t wear gloves, and you don’t want to splash any of these in your eyes.
I also like the citrus based degreasers (several brands available), often found in spray bottles in the auto care aisles. These are really convenient for cleaning off a saw in the field with a rag.
Philbert