Two days ago I installed and compared 3 iPhone cache-cleaning apps on my Mac. Yes these are apps on Mac, so they have the ability to manage and control your iPhone.
Here comes my first concern: since iOS is using the sandbox structure, we can't see folders when iPhone is connected to a computer, how could these apps find cache folders and delete files? Did they jailbreak the phone? I'm running iOS 10.0.2.
Moreover, I realised these apps could be malware, as I found a log file that showed my Mac serial number. What consequences I might have if the SN is disclosed?