Is it possible to revive a down filled coat that's gone clumpy?

[MoonlightandRoses]

It's been fine with the 'bung in dryer after washing' method for months, but seems to have clumped up after the last wash/dry cycle.

Try putting a tennis ball into the dryer with it as this helps beat against the coat

Thank you - will try tomorrow!

Jemma do you need to wash the coat again before putting it in the dryer with the tennis ball, or can you do it dry? Wondering if this will work with my clumpy duvet :(