This simple but effective recipe combines the power of a few simple ingredients. This combination repels flies quickly, as they don't like any of the components. You can mix this concoction and pour it into a spray bottle to spray on it at your leisure.
Unlike some others you will see on the list, this spray does not contain any water, so it isn't diluted. For that reason, you need to be slightly careful about how many drops of essential oils you put in. Measure precise drops, and don't overdo it.