Dawn detergent.
Agree. Dawn original is the most powerful degreaser than any other surfactant made. It was used to degrease birds and animals in the Exxon Valdez cleanup.
Here is the key— use a dilute solution of Dawn and water, for example one and one/half tablespoons Dawn, per quart of water for heavily greasy surfaces. The key is to provide enough water to emulsify (dissolve) grease into the water solution.
Proper diluted Dawn and water will degrease a car engine, even better with hot water, than most petrochemical solvents. And does it safer.
Ditto on that. Dawn is also good if your toddler get half a big jar of diaper rash ointment in their hair........yeah it happened.