Originally Posted by
lonehiker
How to Restore Water Repellency
GORE-TEX® outerwear:
• Machine wash your garment as described in the wash instructions. Line dry your garment, or tumble dry it on a warm, gentle cycle.
• Once it is dry, tumble dry your garment for 20 minutes to reactivate the durable water-repellent (DWR) treatment on the outer fabric.
• If unable to tumble dry, iron the dry garment on gentle setting (warm, no steam) by placing a towel or cloth between the garment and the iron. This will help reactivate the DWR treatment on your garment’s outer fabric.
• When the factory applied treatment can no longer be reactivated, apply a new water-repellent treatment available as a pump-spray or wash-in product to the garment's outer fabric.
From the Gore-Tex website. I was going to recommend ironing the item.