I just received a new Teslong NTG150W and have questions. This is the WiFi version with the flexible cable. I used the program they recommended and it connected great and I had amazing pictures on my IPad in minutes. The clarity is great and setup was easy, but the included instructions leave some things in question. The package included 3 mirrors, two of which were the same and one with a red tip. What is the difference? How should I clean the mirrors? I am thinking Q-tip, but ? This is my first borescope so bear with me... Thanks! Danny