People use peroxide, enzyme-based detergents and even ammonia to soften and remove dried blood from fabrics. However, any of those would be hard on your scalp and hair, and could do harm to your wound scar tissue.
What I would try is to attempt to re-moisturize the clot using a gentle skin-compatible product such as coconut oil, olive oil or any number of the good cosmetic seed oils such as jojoba, argan, or grapeseed oil to soften the clot so it can be just washed out of your hair. Thinner oils would be best. You could just dab it on pretty heavily and cover with a cloth, towel or head-wrap for quite a while, and it might need to be refreshed a few times as it soaks into the clot's mass.
Even a good moisturizing hand or body lotion may do the trick. Again, re-apply often to keep the clot moist with lotion.
Just trying to save you more suffering.......
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