The best thing for getting blood out of fabric, that I’ve found, is oxyclean. As a ranch manager and head guide for a large S Texas hunting ranch, I get LOTS of blood on clothes and packs and boots and I get it ALL out with Oxyclean spray. Peroxide helps but is too harsh, imo, because I’ve had it bleach out some fabrics. My wife buys OxyClean spray bottles by the case full. Spray it on bloody fabric as soon as you can but it even works on well dried blood. Only thing it may not work with is blood that’s been dried in by a clothes dryer - I’ve had some stains that I missed and went through the wash and dryer and the oxy didn’t do anything to eliminate the baked-in stain.
Once you’ve applied it you’ll see it foam up and go to work where it comes in contact with the proteins in the blood. If it’s heavy blood, I’ll scrub it after 15-30 minutes and then re-spray. Let it sit overnight. Then throw it in the wash on medium temp or spray down with warm water. Even a car wash rinse spray would prolly work but I’ve never needed it. Once your pack is clean and dry, you can go about replacing the DWR with something like NikWax.
Now, if you have fat ground in to the fabric, you may need a 2nd wash using Dawn, which breaks up grease. You can even use Purple Power which is a heavy duty degreaser from the automotive store. I usually deal with the blood first and THEN use the Dawn if it’s still needed.
Once it’s clean and dry, apply some NikWax, ReviveX or Grangers DWR and you’ll get less stains next time. Anyway, that’s what works for me with blood.
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