1) If you use your down jacket weekly, you should try to wash it at least every other month. For seasonal users, twice a year should do the trick
2) Don’t be tempted to put any old cleaner in the drum with your favourite puffer jacket. Normal detergents can strip down feathers of their natural oils, making them weak and brittle – we want them strong and fluffy to keep you warm! – and interfere with the water-repellent abilities of the shell exterior
3) Don’t ever iron your down jacket – it will melt!
4) Always store your jacket – and anything filled with down for that matter – in a cool dry place, and hang it up rather than scrunching or folding it into a bag if possible