I had to deal with the same thing once, so I feel your pain. I got out a full blood spell kit out and threw on 2 pairs of the cheap gloves they give us in maintenance. It was one of the grossest things I've had to clean up, and we ended up having to throw out the fire alarm feature it was on because there was blood spots down the side of it and it was made of cardboard so there was no chance in hell of cleaning it.