Note to aspiring Wiccans, neopagans, and progressive Catholics:
A spray of evergreen or a pine cone will also do the job nicely. Your fingers work, too, but you need to practice or else those closest to you will end up in a Sea World-like splash zone.

A toilet brush will also work, but it's hard to begin a purifying ritual with a tool that everyone imagines is rife with fecal coliform bacteria.