lmaoo here's some tips from me: wash under the sink first before using a machine, use only cold water (if you use hot water it probably won't wash off anymore or just hardly), use soap (any kind really, I always use white handsoap) - rinse off the blood stain with cold water first, after that rub in the soap on the stain - then take both of your hands and rub the stain like idk how to explain but use a bit of strength while trying to get it out - and then do the same thing while rinsing it off with water & repeat this until either the stain is completely gone or until the blood came off and if you can still see the stain a bit it's no problem, you just put soap on the stain again but don't wash off so just leave it - in the end you just wash it normally in your washing machine and it should work

Why would you try to wash blood stained shirts?? Especially when they're white.