The Dhobi Was just the massenger from lord who was sent to convince Rama about the next duty's of him which leaded the Ramayana to an End. Rama Was not born to rule the kingdom and enjoy the rest of his life just like other normal kings. there was lot he was suppose to teach and be moral for next generations and when he got stuck in kingdom after defeating and killing Ravana, The lord Shiva Assigned the new roll and job to one of his Rudhragana Who came as Dhobi ( Madiwala ) And Reminded Rama in a harsh way about Sitha Matha Going Back to Vaikunta and Lava Kusha's Birth Who were next rullers of Ayodhya. This Incident Teaches how the Rullers should respect an individual citizen irrespective to their cast or wealth. By taking such decision Rama Proved that king respects not only his Father or family but he also respected the normal citizen DHOBI. when it comes to keeping up the promises All rulers should have this in mind. Not Like the current politicians who just work for their family, their cast,their benefits, their generations Pls Learn from Ramayana How to respect the Common citizen and how to give importance to them. IN THIS INCIDENT DHOBI IS JUST AN INSTRUMENT USED BY LORD SHIVA TO ENRICH THE MUSIC OF RAMAYANA.