On 3/19/2013 6:02 PM, Andrew Gabriel wrote:

I have sometimes smeared some liquid soap on the stain before
putting it in the wash, on the basis that the cold fill and
the soap will work on it before the wash gets too hot. However,
the longer the stain has been there, the longer it will need
to soak, so that probably only works if it's still reasonably
red.

For fresh bloodstains, hydrogen peroxide works well (but check first on
a hidden part). After the fizzing stops, rinse with cold water, followed
by rubbing with plain bar soap (not detergent).