For most of the high end Android phones, Google, HTC and Motorola will uptdae them into the latest version automatically, the only difference is that they have different timeline due to customization of Android

The reason it is a "secrete" is a plumber does not sell or use useless chemicals

A plumber would use a snake (cable) for hard stoppages and a water jetter for soft stoppages such as grease or soap scum

Most chemicals are as useful as using food coloring in water and placing two asprin down the toilet ALL a waste of money in my professional opinion