I'm not going to make the switch and stop making my own detergent (I really enjoy the process of making my own products), but I am going to keep a bottle of Wisk on hand. It really helped us out with a few tough stains. My clothes came out clean and smelled fresh.While I couldn't confirm that a build up of oils were removed, I can confirm that it is one of the best detergents I've used.
Disclosure: I was sent a sample for review. My opinions were not influenced in any way.