How do you get rid of fruitflies?

I made a smoothie a few days and didn't wash the blender immediately because that was the only thing that was dirty. In 2 days, it filled up with about 100 fruit flies. I cleaned my entire kitchen with chlorox, washed all the dishes, took out the trash, and sprayed bug spray. They are still here though. I also made a trap with a 2 L bottle of soda and a banana as bait. That seemed to make the problem worse so I got rid of it. Now what?