Deep clean grooves, gaps, and corners with our bottle-cleaning brush! . This brush is strong in decontaminating tiny grooves and can be used every day to clean bottle lids and caps. . U-Shaped Brush: Matches the cup mouth to clean stubborn stains around the cup mouth. Brush: Clean the narrow grooves on the inner wall of the lid. Corner Brush With Hard Bristles: Removes dirt from the corners of the container. . This brush is soft on all surfaces and will not harm your home cleaning.