I've made several batches of GM soap and they have turned out well. I just bought a couple of books and they both say milk MUST be pasteurized, but they don't say why. I have not pasteurized any of my milk. It goes straight from the goat to the freezer. I add my lye to the frozen GM. My oldest batch is just turning 4 weeks old this week. Is it going to spoil or something? Thanks....