How do I remove oil from soup?
The easiest way, is to cool (fridge) it down and remove the hardened fat that should have floated to the top.

You could try doing while the soup is hot by using a shallow spoon and spoon the liquid fat from the top, or use absorbant paper to absorb the fat.

In both cases, it will never remove all of the fat, especially if the soup contains meat or is not a clear soup (like a consommé)