Amanda has typically been very unhappy about getting her hair washed because she doesn't like to get water or shampoo in her eyes. I don't blame her. So we try to be very careful about keeping the water out of her eyes when we rinse the shampoo out.
The way we do this requires two people: one person to support her as she leans back, face-up in the water, and the other to take a cup of water and rinse her hair. We call this "tippy" because we have to tip her back into the water so that when we pour the water on her hair it runs away from her face into the tub. Donna holds her while I pour the water.
This has been very successful. Almost too much so, because now we have to make sure we don't say it's time for "tippy" before we're ready, else Amanda might lean back right away into the tub. She'll even ask for "tippy" before we start the shampoo.
We do the same thing with Elena, but she typically is not as sensitive to water in her eyes.