[header] How to get blood out of cotton [title] Turn the water on to the coldest possible setting. [step] Let it run for a few minutes, especially if it is a hot day, so that the water can cool down some more. [title] Hold the fabric taut between your hands. 
[step] Gently grip the garment, keeping your fingers to either side of the stain, and pull. The fabric should be stretched out, like the top of a drum.