Q: Is it permissible to change the Ihram (clothing worn during the ritual state for Hajj and `Umrah) to wash it?

A: There is nothing wrong if the Muhrim (pilgrim in the ritual state for Hajj and `Umrah) washes his dirty Ihram or wears another clean or washed one.

[Fataawa Shaykh Ibn Baaz - Alifta.net]