Try using hydrogen peroxide, that usually gets blood off of everything…
Also, have you rinse it with cold water. I would do that first try to get as much blood off as possible then put hydrogen peroxide on the places with blood stains. Let it sit for 5-10 min and then rinse off with cold water.
I’m scared to touch it with hot soapy water incase I rub it in and make it worse 🙃