We all know how difficult it can be to reach the bottom of the various containers to clean them. However, with Esska's bottle brush, it's no longer a problem. It is two brushes in one. The larger part is used to clean the inside of the bottle, while the smaller brush at the other end is used to reach all the nooks and crannies of the nipple. The small brush is in the handle and is easily extracted from the handle. This way you always have both brushes in one place.