A small brush with big cleaning power! Keep vent inserts and reservoirs clean in any Dr. Brown’s bottles with Dr. Brown’s™ Cleaning Brushes. Happy Feeding™ stays happy when you use the Cleaning Brush to clean and clear blockages of dried milk and formula. The multi-purpose, lightweight brush easily maneuvers through all Dr. Brown’s bottle components – especially the Dr. Brown’s Internal Vent System – for a fully clean and functioning bottle interior. Also use to clean sippy and straw cups. Replace lost or worn brushes with this 4-brush pack or just have a few spares on hand! BPA free.