It doesn't matter if you missed the bottom step at the cabin and skinned your knee or if you cut yourself shaving.  Blood stains happen and they can be a pain to try to remove.  I came across a 'simple solution' that works and thought you would like to have it handy.

It's easy and it's only three ingredients

The mixture is:
1 tsp. Dawn dishwashing detergent 3-4 tablespoons of hydrogen peroxide couple tablespoons of baking soda. Scrub on with a scrubbing brush.

It's worked on everything I've tried it on!  Good Luck!