They use a no-rinse shampoo, spray themselves with water to rinse off the soap, and finally, use a vacuum hose which sucks up all the water from their bodies.
First, we have to bleach the hair which is what we're doing right now so it is lighter and then after the bleach is done processing we rinse it out and then we put on the blue.
And if you require moving parts in your design, the printer simply leave gaps in the right spots, or uses a special gel that can be dissolved or rinsed off afterwards.