How do I clean blood out of a white carpet?

Try dabbin with rubbing alcohol

Spray with peroxide.

Hydrogen peroxide and patience. Apply, soak up, dry. Repeat.

Hi Nan

I agree that Hydrogen Peroxide should remove/bleach the blood out of the carpet. However, if it has dried, you'll want to brush off as much as you can. At that point, it might come off using a scentless detergent then blotting the stained area. Check out this short article. Wishing you the best.

https://www.goodhousekeeping.com/home/cleaning/tips/a16073/remove-blood-stains/

My daughter used Oxy to get red wine out of her tablecloth, and hair dye out of her rug.

maybe add baking soda to the hydrogen peroxide