Check Brush Head Size Before Buying: With Its 12.5 Long, Non-Flexible Steel Shaft And Rugged 2 Silicone Bristle Head, Our Water Bottle Brush Gets Deep Down Into Tall, Narrow Containers Such As Insulated Water Bottles, Hydroflasks, Thermoses, Baby Bottles, Vases And Skinny Glassware. | | How To Use: Be Aware That Silicone Is Non-Absorbent And Cannot Hold Soap Or Lather Up Like A Sponge. For Best Results When Using Our Bottle Brush, First Add Warm Soapy Water To Your Container, And Then Scrub Away. The Minimum Diameter Neck The Brush Will Squeeze Into Is 1 1/8 Wide, So ItS Not Suitable For Cleaning Beer, Wine, Swing-Top Or Kombucha Bottles. | | Better Hygiene For You: Our Silicone Water Bottle Cleaner Repels Unpleasant Odors And Stains - Unlike Sponge And Nylon Brushes That Fall Apart, And Get Smelly After A Few Uses. This Bottle Scrubber Prevents Nasty Grime Build-Up Which Is More Hygienic And Healthier For Your Family. | | No More Scratches: The Easy-Clean, Non-Scratching.