The water must be ice cold; under no circumstances should you ever attempt to remove blood stains using hot water because blood is composed of protein.
Using Ammonia To Clean Blood Stains Out Of Clothes. To remove any excess material from the stained area, use a knife to scrape it.
Using Enzyme Products To Clean Blood Stains Out Of Clothes. If the stain is in a very noticeable place and won't come off, move on to enzyme products to save your fabric.