how do you get oil from whales?

i believe whaling was the biggest industry at one point in recent 
history, i heard it.

they were like mobile oil fields, which made me wonder about the 
oil. i would think whales are mostly blood and flesh..

then i remembered that you can get milk and oils from everything, 
there are milk and oil versions of everything.

all of life is just milk and oil. aliens can convert all humans 
into milk and oil if they were mad.