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Freeze the Cream Ahead of Time
Frozen heavy whipping cream cubes for milk soap
To get started with method #1 (using the milk in place of water in the lye solution), you're going to need the cream to be frozen. - so freeze the heavy cream (or whatever milk you're using) in an ice tray. While that's freezing, we'll move on to method #2, which is using a double strength lye solution, and adding the cream directly to the oils.