frankrb3
WKR
I just throw it in the bathtub with hot water and some mild detergent and scrub it with a brush. I used to take my issued military pack to the DIY carwash on our base and I would blast it with a power washer. Never hurt anything but I haven't tried it on any of my own packs yet. Worked really well at getting stubborn stains though and I would do it again on my own packs if I ever feel the need. It's also fast and keeps you mostly dry.