When you fork over $200 or $300 for a fancy waterproof/breathable rain jacket, you expect it to keep you dry for a good long while. And you should. But the time will come when your jacket seems to be absorbing rain rather than repelling it. This is because the outer fabric’s DWR has worn off.

DWR stands for “durable water repellant,” and it makes water bead up and roll off the fabric. But just like a good wax job on your car, this coating wears off over time. When this happens, don’t immediately go storming off to the shop that sold it to you. There are some simple things you can do to revive it.

Wash it: It may sound simple, but I’ve known people who have gone years without washing their waterproof/breathables for fear that they’ll harm it.

You should always check the instructions on the label, but for the most part, occasional washing is a must. Over time, things like dirt and campfire smoke get into the fabric and prevent the DWR from doing its job.

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