For milk with a fat content of 1.5%, petroleum ether was the most efficient. Now I'm looking for a reagent for yogurt, butter, and cream. I have to eliminate the fat in different dairy products to be able to filter them.
To extract fats from milk and yoghurt you can make mix from petroleum ether and diethyl ether. Shake well and extract fats in the solvent layer. you can repeat this step two or three times to eliminate all fats. This method is not suitable for cream and butter