Australia's Science Forum

Try a 10% fresh sodium thiosulphate solution and leave it soak on the bench overnight. A light scrub with jiff the next day should do the trick.
Cheers

we do a really good forensic bloodstain detection prac that uses a spray on mix of hydrogen peroxide and luminol which glows a bright blue when in contact with Haem from blood. We use horse blood which I apply to all different dark surfaces from wood to cloth, allow this to dry and give to students ...