Originally Posted by
Bandera
There is, and it's done in the washing machine.
Nikwax "Cleans effectively, reviving breathability and water repellency."
Works on all of my breathable kit, tents etc to keep them in useful service when the DWR finish gets old.
It's kit maintenance like lubing a chain...only cleaner.
Wash-in cleaner for waterproof clothing and gear - Tech Wash
-Bandera
Yes ... and I can't remember if we picked up that or something like it, or just looked at it and decided to get it next time. Either way, I haven't gotten around to using it yet.