It can be hard to reach inside a narrow bottle with a sponge; instead try a bottle brush. The 360° bristles are specially shaped to fit inside bottles, jars, cups and bowls so you can scrub every inside edge with ease.
Wire Handle Bottle Brush – This brush can fit in smaller spaces, like containers with narrow bottle necks and water bottles. The bristles are sisal, with cotton fibers at the end. 360° bristles ensure that every corner is cleaned.
Do not place in dishwasher. Rinse soap and food residue out of bristles after each use. Let brush air dry between uses by hanging on a loop or standing up to preserve the wood.
To disinfect: Submerge brush head in 1:1 hot water + vinegar for 10 minutes.