It is recommended to handwash your sacred womb-band gently with cold water and allow it to air dry. Think of the washing as a ritual to maintain the elevated frequencies of this healing accessory. Alternatively, you can have it dry-cleaned.
Consider storing the womb-band with your crystals and with a black tourmaline: Black Tourmaline is known for removing unwanted energies, it energetically cleanses your crystals and the womb-band automatically. You could put them together on your altar or in a drawer, as long as you keep them together.
Cleanse the black tourmaline under cold running water, once or twice a month, or more often as you feel guided.
Before you use the womb-band for the first time you may want to connect to it with intent and check out some ways to activate it.