In case any of you run into this at some point in your lives, as scary as it sounds, baby oil will remove petroleum jelly from your hair.
After trying many things and being frustrated, I gave in. I massaged Cate’s hair with baby oil then washed it with Dawn dish soap.
I guess the baby oil dissolved the petroleum jelly, and the baby oil is a lot easier to wash out than the other. It looked a little greasy until the next day, and then it was back to normal.
So if your 3-year-old decides to put Vaseline in her hair, don’t panic, and go straight to the baby oil.