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ah, I recently sent almost 10 year old jacket for a repair, they do an amazing job
they offer wash/clean too https://rab.equipment/uk/insulated-clothing-repair
I recently bought a heavily used RAB down jacket too, washed in nikwax down wash today and light tumble dry as per their instructions and it seems have held its shape really well.
@cake pointed me to the tennis ball method: https://www.cleverhiker.com/blog/less-stink-fluff (or dryer balls)
needs a proper clean, used to send it back to a place in sheffield when i wore it, and the down has migrated or flattened from one side of the back from years of walking around with a shoulder bag on that side.