How to wash a down jacket?

How to wash a down jacket so that it does not wear out and is still fluffy.
A lot of people ask us how to wash a down jacket. When you wash at home, it often happens that after washing the jacket does not look like before, it is not so fluffy anymore. In order to wash the jacket well, an ordinary household washing machine is not enough, but a professional washing machine and dryer.

I need to wash this down jacket; it doesn't have any washing instructions. Anyone have any info on how I wash this? Soil may be veg oil : r/CleaningTips

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