Be really careful with full strength hydrogen peroxide. It is a bleach of sorts, and may take out the color as well as the blood. As a nurse, we used it to take blood out of our white uniforms, but I would never use it full strength on colored cotton. The saliva trick really works well, just did it again last week. (Guess I am showing my age, we wore white uniforms long before everyone from the docs to the housekeepers wear scrubs!)