If you think that's nasty wait till you see the speaker holes!
Gross: Watching An iPhone Get A Professional Cleaning

In things I didn’t really need to see news, this is a video of Ireland based Phone Fix Craft (a phone repair business) owner Julius Caveckas deep cleaning and repairing an iPhone, with a lot of macro shots for extra grossness. Honestly, my phone is at least twice that dirty. It’s so dirty whenever I make a call both myself and the person on the line have to yell because the speaker and mic holes are so clogged. My girlfriend hates it. “I’m tired of having to yell at the grocery store, it’s embarrassing.” WHAT — YOU’RE AT THE GROCERY STORE? COUNT CHOCULA AND CINNAMON TOAST CRUNCH.