Is your hand-washing technique effective? Good Health used a special UV camera to test methods — from a quick ‘rinse and shake’ to more than the advised 20 seconds — to find out.
First our journalist rubbed on a gel known as Glo Germ, which simulates how germs cling to your skin.
The gel is clear but glows under UV light and contains particles the same size as germs such as coronavirus. The whiter the hands in these pictures, the dirtier they are — and the darker they are, the cleaner.