| грязная голова | dirty hair |
| чистая голова | clean hair |
| мыть/вымыть головуa | to wash one's hair |
NB The expression мыть голову, above, is much more common than мыть волосы "to wash one's hair," which is perceived as slightly substandard or formal (as used in the instructions on some shampoo labels, for example). | |
| У меня голова грязная, надо её вымыть. | My hair is dirty, I have to wash it. |