Reply from our Silentnight Expert:
All our Silentnight electric blankets are machine washable - as the connector on the blanket has a special compound inside it to ensure that all the internal components are waterproof.
You do have to follow the instructions by disconnecting the power lead from the blanket connector and also ensure that the blanket is fully dried before connecting back up again.
If you do not have the instructions for disconnecting the power lead please contact Comfy Quilts on 01625 446000, as they make these products under licence for Silentnight.