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
(..) Well, I need some coffee. OK, in we go. It looks pretty ordinary to me. Keep looking. Your coffee, sir. Decaf latte with non-fat milk. Oh, champion. Steaming sump oil. Wait, what did you do? I don't know. What did I do? (..)2001 Lara Croft: Tomb Raider