Materials and Engineering: Why Bristles, Bases, and Handles Matter A toilet brush is more than a cleaning stick; it’s a small piece of engineering that must reach tricky angles, shed grime quickly, dry fast, and resist odors. Material choice is the starting point. Traditional polypropylene bristles scrub well, but they can trap debris. In contrast, a silicone toilet brush uses flexible, hydrophobic fins that repel water and reduce splatter. This design helps cut cleaning time and limits bacterial growth simply by allowing less residue to cling in the first place. Look for high-grade silicone or TPR (thermoplastic rubber) that keeps its shape after hundreds of scrubs, with a head density…