Are we talking "I cut my finger and it dripped" or "I have no clue what happened to her officer, did they really find her decapitated? I haven't seen her in a couple weeks" kinda blood? Download the autopia guide to detailing here
http://www.autopia-carcare.com/how-to.html I use Natures Miracle (from local pet store) it's an enzyme based cleaner that breaks down all sorts of crazy stuff (milk, baby formula, blood, cat urine, vomit etc.)