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The easiest way to remove stock and broth fat is to use air stream blowing to the liquid surface, the floating fat will be blown to the other side of the container right away, leaving a fat free surface to scoop out, or skim the cornered floating fat, very simple. You may use hair drier, or the fat removal blower called Grease Out.
The air stream blows and corners the floating fat, leaving a big fat free zone on the top of stock. Either scoop out stock fat free, or easily skim the idle floating fat.