He was filled with 'the milk of human kindness'. [=he was filled with kindness; he was very kind]
They 'milked' [='exploited'] their advantage for all it was worth.
greedy landlords 'milking' their tenants of all their money
(..) The others went off to the war or runned away. I can't take care of that baby and sick folks, too. I's only got two hands. Who's going to milk that cow, Miss Scarlett? We's houseworkers. As God is my witness.... As God is my witness, they're not going to lick me. (..)1939 Gone with the Wind
(..) We don't need no cow, Miss Scarlett. We'll be home soon, and I's scared of cows. Tear up your petticoat and tie her on to the back of the wagon. We need milk for the baby, and we don't know what we'll find at home. Melly! Melly, we're home! We're at Tara! Hurry! Move, you brute! (..)1939 Gone with the Wind