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Wouldn't be much fun in that, so all I'll say is you need something from UNA

Buy the Refinery from New Ark, basically.

Well... 

After renovating the Empty room in the Milk Farm, you can buy More Milkers, get a fridge from Pixie, and buy more additions from the New Ark Laboratory, upon entering the Lab take the Stairs going down, talk to the Receptionist to find the Upgrade. 

Upon buying return to the Milk Farm, a refinery should be there? It has been quite a while for me, insert any milk, Devil Milk, Angel Milk, or Self Milk, go someplace else then return to collect Cheese....