You finally just got done doing the dishes, cleaning your house, and one of your friends stood in front of window with a dozen zombies outside. As they come pouring through and your friend tries to makeup for his mistake, there's now blood in your kitchen, livingroom, and clothes. Ugh. Here's how you can clean it up.
1. First, you'll want to find a Towel or Mop, as well as some bleach. (Don't drink the bleach).
2. If there are a load of corpses, right click them to pick them up and move them.
3. With the bleach and a towel or mop in your inventory, right click the ground and you'll see the option to Clean Blood.
4. You'll now see a green indicator on the tile where the blood will be cleaned.
5. Your character will now clean up the blood when clicked.
6. To clean yourself, approach a bathtub and click wash.
Enjoy being all clean.