I work in a Lab and I know for sure how to get blood out of cloth. Start with a little bit of salt water, 1 teaspoon of salt per cup of water. Let that soak in and try again, blot DO NOT RUB, the spot and the blood will start to lift off - keep this up until the spot gets as light as it will get. Then use hydrogen peroxide. Pour this on the spot. The spot will bubble - repeat as needed and the spot will disappear completely. If you use bleach there is a chance the spot will turn brown and stay that way -- for ever.