I use dental floss and a waterpik.

The dental floss I use is Johnson & Johnson Rich. It has a mint scent, so flossing gives a refreshing feeling and leaves my mouth feeling clean. I also like that it is 50 meters long, so it lasts a long time. The oral irrigator I use is the Oral-B Waterpik. To be honest, it is a bit of a hassle to use, so I don't use it often, but I use it when I feel that flossing alone isn't completely removing debris.