To start, put some tape over the flash on your phone and then take the blue sharpie and color over the tape. Once the sharpie dries, apply another piece of tape over the flash and to get the necessary opacity, color over the tape again with the blue sharpie.
Once the second layer of tape has dried, place another piece of tape over the flash and color over it with the purple sharpie.
Now all you have to do is turn on the flashlight option on your phone in complete darkness and take a glimpse at surfaces you have always assumed as clean.
The bathroom might just shock you.
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