Blood usually washes off with warm water and soap. Don't use cold and don't use hot. You may also want to use a scrub brush lightly. For hard to remove stains use cheap hair spray. This is a trick I got from a neighbor who worked at a hospital for removing blood from white sheets and found very successful. Also found successful in removing other stains. Spray on and let it set and then wash with warm water; light scrubbing to aid as necessary.

Be carefull with dried blood, for it can still can submit Hepatitis. Which you don't want to end up with.

There were already some good advises given to remove such stains.

I have loads of "Number 1" rules but I thought this one I saw on the front page of Metro is really good

"Don't Dream of Winning - Train For It!!!!" by Mo Farah

Another 1 is

"Nearly ISN'T Enough!!!!" by Paula Radcliffe

"Nearly" works best in horseshoes