What mechainc brings their tools out of the shop and into the bathroom with them? Maybe the crescent wrench was used in the bathroom to fix a dripping fixture or something.

I’ve also definitely gotten nearly that dirty before. If i don’t degrime an engine before working on it, all that thick black built up grime will eventually end up on my hands and forearms. As i scratch myself or wipe sweat the grime slowly covers most of my body. I also often have to lay on the dirty shop floor or driveways which can also contribute to getting filthy.