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 manoeuvres 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.