If la or el = the , then why is las here 'his'?
When talking about body parts, Spanish uses the article. Since the verb is reflective, you know that it is "his".
Thank you for the clarification
Why is it lavarse and not lavar
The reflexive "lavarse" is used when the action is done to oneself (washing body parts). "Lavar" is used for washing things (dishes, clothes, windows).
This answers one of my big questions- Thank you
What is the presenter trying to prove? Is it that she is bond to be not understood no matter where she is presenting. To me she sounds like she is in her cups all the time.
there's no "she" or "he" behind the voices. They are computer generated vocalizations. On this in particular the voice is as garbled as static on your TV.
I would translate it with: He has to wash the hands
Why not THE hands? Doubtful he would wash someo0ne else's!