Soft nylon bristles protect the of the cup and bottle from being scratched, flexible enough to slip through narrow areas to reach every and cranny but always keep their shape, and will not break off or . The small bottle brush with long handle specially clean the small entrance and bottle. The larger bottle brush with scraper design on the side and bottom can and remove stubborn dirty. Multifunctional L-shaped brush: 90°right without dead ends. It is easy to clean glass, ceramic cup, cup, vacuum flask, , more and safe.