Used olive oil on hair?

I did this after reading up how nourishing it is for your Hair. I spent 30 minutes rinsing it out, and shampooed 5 times, but it hasn't all came out! Half of my hair feels greasy and the rest feels dry! This isnt what I expected from this. How can I get it out without using dish soap and ruining my hair? I only have a small amount of time to wash my hair tomorrow morning so it can't take too long!