I dont think snakes are smart enough to switch from a soiled bowl to a clean one. I sometimes worry..I fed my baby sumatran last night and you would think he would go to the warm side of the cage to help digest, but he just went to the cool end. If my python relieves itself in a hidebox over night, he'll stay there til` next morning when i clean it. Also, my blood will not voluntarily soak. He has the water dish and everything, but he never uses it. Snakes have weird ideas about comfort.