The article discusses the best bottle brushes for cleaning your reusable water bottles. The most common type of bottle brush is nylon, with nylon bristles either threaded through a metal wire or fused into a plastic stem. Silicone brushes are cheaper than nylon ones and are easier to clean and sterilize due to their smooth surfaces. Nylon brushes can also be used to clean threads, caps and spouts. Straw brushes are thin and narrow and can be used for cleaning interiors and cleaning threads. However, foam brushes are not the best for cleaning due to potential scratches. The article was reviewed by Ketia Daniel, the BestReviews Cleaning Expert.