Bull polishing or spit shining refers to a method for polishing leather products in such a way as to give an extremely high shine effect. It is commonly used in the military as a traditional method of presenting leather accessories and boots for inspection. The finished effect should leave the surface of the leather as reflective as a mirror.

This leather is polished, if the leather is particularly burnt down with 'bees wax', a process that gives the leather a smooth finish. The leather is polished in the normal way with a brush few times to get a decent regular finish. Thin layers of polish are applied in a circular motion until a dull, smooth shine appears. Ultimately, the process involves polishing the applied thin layers of polish not the leather itself. The process can be lengthy and is best learned with practice.