If you have a top loader washing machine. Start the water and add the detergent. Add some bleach. I used a half cup to a cup depending on the colors and fabrics. Then let the water continue to fill. When it starts agitating add the blankets one at a time. The bleach should be so diluted that it won't put bleach spots on them but it might.
Bleach kills the germs and odors deep in the fibers.
If it's a front loader then put the blankets in and start the machine. Add the detergent and fabric softener and then, in the other dispenser put it about half full of bleach then add a little water to it. This helps the bleach disburse in the washer better.