bottle sponge

Common materials include cellulose and various foams (for example, polyurethane), plastic components for brush handles and cores, silicone detail cleaners, and a mix of soft and firm bristles for scrubbing.

Dual-sided sponges combine a firmer scrub side for tough, baked-on messes with a softer, absorbent side for gentle cleaning and lathering. Ergonomic shapes (finger holes, tapered mouths) also improve grip and let you reach into narrow or oddly shaped items.

Many bottle brushes use a flexible neck plus a mix of soft and firm bristles so the head can bend to match curved interiors while scrubbing. Some designs also include upright stands and shapes that promote faster drying of brush heads and bottle parts.