Soap that washes oil of feathers good (science fair project)

[Bixlancy]

Hello, I'm doing a science fair project on what soap washes oil the best off of feathers. I was just wondering if anyone knew any good soap companys.

Thank You for your help!

[critters]

Dawn dish soap is widely touted for that exact purpose during oil spills and the like; in fact, I recall ads trumpeting that fact.