👉 The postal fluid, also known as postal carrier fluid, is a specialized liquid used in the postal industry to keep letter carriers' boots and shoes from becoming overly worn and to prevent dirt and debris from accumulating. This fluid is applied to the soles of boots and shoes, providing a protective layer that maintains their shape, reduces friction, and enhances grip on various surfaces. By keeping carriers' footwear in optimal condition, the postal fluid helps ensure efficient and safe delivery services.
