Alatar, you will not obtain this look only washing the hair... you have to mod the ugly hairline, but it's very easy to do...
literally anyone can do this
1) detach the head from the body
FRONT
2) separate "face mask" from the rear part of the head... it's very simple, just gently pull it out and it will detach... it's very poor glued from the rear part...
3) take a cutter and work inside the front to gently remove little by little about a mm of silicone, so the head front, when re-attacched, will sit more flush. Working inside you don't damage the skin texture or the paint. You only have to be "patient" and remove the excess little by little, to avoid risk of damage. After that you can proceed on back part of the head.
BACK
4) Just under the front hairline you will see a black rubber portion without the hair... Cut away that as near as possible to the glued hair without remove them...
5)wash the hair with warm water and some soap...
6)glue back the face mask on the head...
done.
Obiously the final result it's not as good as a perfect implant, but it's very easy to do and exeryone can achieve a better result with minimal effort...
hope that helps...