Rub one pump of Glitter Bug lotion into your hands to simulate what it would be like to have germs on your skin.
Look at your hands under black light. Can you see the simulated germ glow?
Using soap and water, wash and then dry your hands like you normally would.
Use a black light to check your hands and see if any germs remain on your skin and fingernails. Any areas that glow under the black light will reveal any weak spots in your hand washing technique.
Improve your technique. Do you need to wash for a longer period of time? Do you need to use more soap? Do you need to scrub your hands in a different way? What variable(s) could you change to clean the areas that the black light revealed?
Repeat steps 1-4, but try changing one variable at a time. Measure and write down your results. Repeat these steps until you are unable to see any spots under the black light.