OK.. I use Armor All at every oil change on CV boots, steering boots, tires, etc.
It did a fantastic job of removing carbon, soot, an smoke stains from the grill and the fire ring. Haven't tried to remove any grease with it.
In the Wiki you linked it says it is used as a dry cleaning solution too! So I guess it will "degrease".
"PDMS is used as an environmentally-friendly dry cleaning solution under the licensed name GreenEarth Cleaning"