There are a few ways to clean blood off concrete. One way is to use a vacuum cleaner with the hose attachment. Another way is to use a bucket and pour water onto the concrete and then use a plunger to suction onto the blood and pull it off.
There are a few ways to clean blood off concrete. One way is to use a vacuum cleaner with the hose attachment. Another way is to use a bucket and pour water onto the concrete and then use a plunger to suction onto the blood and pull it off.