Don’t work with your phone in your pocket
 

Did some simple fixes on the car this evening. Some of it meant crawling around under the dash.
Went for my phone about an hour later and it looked like a spider had ink on his feet crawling along the screen. A bit miffed when the phone is only a month old. To my delight realised I had a glass screen protector fitted and after a bit of persuasion it came off to leave a clean and undamaged screen.
Talk about lucky. Phone was in the side pocket of my shorts.