Is it possible to get the blood out? I have cleaned it as much as I can. There wasn't any Vanish in the house so I used Simple Solution, which is an enzyme based cleaner used for clearing up after dogs. I have also turned the mattress. I think you are only supposed to use one side, but I thought it would be better to let the air get to it on the bottom instead of covering it with a mattress protector, sheets etc. Is this sensible???