Most of the sound, as well as cheap cotton duvets, can be washed in a washing machine. However, the label will be able to share more information on this. The delicate ones have plenty of features in them, and often the irregular cycles of the machine are not the best. For this, hand wash them gently, making sure you don’t soak them for an extended period. The quality of the washing liquid is also essential as you need to go with something mild and fragrant-free. You can also use a softener if you wish, but it’s not required. The cycle should be the gentlest one. Keep an eye always on the machines, so it’s not sitting around soaking in the water for long after getting washed. Remove and dry thoroughly before using it again.