Here's what other sites are saying:
Unlike common detergent soaps which will leave a range of water-attracting chemicals on a garment. Granger's Performance Wash will remove dirt, grime and odors from clothing while protecting the DWR (durable water repellent) finish, scent free. It effectively cleans technical outdoor clothing optimizes breathability and maintains water repellency. Granger's has always been at the forefront of developing the most environmentally responsible products. Granger's was the first company to develop water-based aftercare products and were the first after-care company to be a bluesign(R) system partner.
Granger's Performance Wash effectively cleans technical outdoor clothing to remove odors, optimize breathability and maintain water repellency. Great for use with down jackets, base layers and waterproof apparel. 1 cap full effectively cleans 2 base layer garments; 1 cap full cleans 1 jacket. Waterproof apparel should be tumble dried after washing to maximize water repellency. The water-based Granger's Performance Wash is recommended for use on all fabrics, including Gore-Tex(R) and eVent(TM).
Thinking about washing your down jacket with regular detergent' Frustrated that your baselayers still stink even after a regular wash' Think again--that grocery-store detergent you see advertised on race cars can damage your (expensive) gear's protective features without putting a dent in the stank. Use Granger's Performance Wash and get the dirt and grime out of your favorite outdoor clothing without ruining the waterproof finish. This scent-free wash is safe to use on down and baselayers and actually improves fabric breathability and water repellency with each use.
Granger's Performance Wash safely removes dirt, grime, and odors from technical clothing while protecting the DWR (durable water repellent) finish.
Granger's Performance Wash/XT Waterproofer Kit
Granger's Performance Waterproofer
Granger's G-Wash Cleaner
Granger's Natural Wash Plus
Nikwax TX.Direct Spray-On
$9 - $21
Nikwax TX.Direct Wash-In
$7 - $34
Nikwax SoftShell Proof Spray-On
Nathan Sport-Wash Blox