I never thought of that.
But I usually just unplug the freezer just long enough to let the ice loosen a little bit. Then I can slide the ice right off the walls. Throw it in the sink and let the running hot water melt it down.
And I don't even have to empty the freezer of the frozen food either! This method also save time. and the freezer doesn't loose too much of the cold air. But the next time that I defrost it, I might try the oil remedy. Sounds nice!!