I think most of this is for blood in fabric, but you may be able to adapt it to your situation.
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Fresh Blood:
Cold water or Club Soda. Sponge stain immediately with cold water or club soda and dry with a soft absorbant terry towel. Repeat as necessary.
Dried Blood:
One reader reported that in nursing school they tell students to use peroxide on the blood before washing. She reported it really works. I'd test a small section as it could also have a bleaching effect, but worth a try.
or
Mix one teaspoon of a mild ph balanced detergent (a mild non alkaline non bleaching detergent) with a cup of ice cold water
Blot
Mix one tablespoon of household ammonia with a half cup of ice cold water
Blot
Sponge with clean ice cold water
Blot
Note: Always test an inconspicuous area for colorfastness, etc. before treating the exposed area. Also note that certain stains are permanent
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Also check here:
http://tips.tipking.com/cleaning/tip_59.shtml
http://tips.tipking.com/cleaning/tip_59.shtml
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