I had a home birth and when the baby came everyone forgot that I had bought a bunch of towels for the birth, and instead grabbed a quilt my great grandmother made me! I had a really bad couple of weeks after the birth, and for some reason it was one of the only things that didn't make it into the wash the day of with everything else. Anyway, it is dried blood now, and I read somewhere to wash it with a cup of salt, and then wash it again with regular detergent. I think that is for fresh blood, but I'm hoping it will work now. Should I use hot or cold water? Hot seems obvious to me, but I don't want to mess up. And if you have any other ideas for getting this dried (but never washed) blood out of my quilt please share!
Have you tried treating it with hydrogen peroxide? My MW has two large bottles of this on my HB supply list, specifically for getting out blood. You could try this in an inconspicuous place before washing.
Oxyclean works wonders on dry blood. In fact, I would use a scrubby brush and oxyclean on the spot (after wetting the spot with cold water) and scrub away on it if the hydrogen peroxide doesn't do the trick. I have known people who actually make a paste out of oxyclean and hydrogen peroxide to scrub stuff out. Always wash in cold and you can try this as often as you need to.