Quick, clump-free ways to wash them yourself
If yours has an agitator (if not, see right), don’t cram in a duvet larger than a single, as it probably won’t be cleaned and could be damaged. Take double duvets and bigger to a laundry. For a single duvet, pretreat any stains and place the duvet in the empty machine. Choose a gentle cycle and the highest water level, plus an extra rinse and spin. Add liquid detergent to the water as it enters the drum.
These machines, as well as top loaders without agitators, are generally big enough for a queensize or even a king-size down duvet. They also come with preset cycles that may add a second rinse and lower the spin speed for optimal cleaning of bedding that’s this bulky. If your machine doesn’t have a dedicated bedding cycle, choose the normal cycle and manually add in the above options.
Choose low heat in your tumble dryer and pop in a couple of tennis balls to ‘bounce’ out clumps. If you don’t have any tennis balls, stop the tumble dryer a few times to pull apart any lumps yourself.