Remove anti reflective coating using Armour Etch

This video shows you how to remove anti-reflective coating off your polycarbonate lens. This WILL NOT work on a glass lens, it will only make it worst.
What is Armour Etch?
Armour Etch is a fast acting specially formulated glass etching compound that lets you create permanently etched designs on windows, mirrors and household glassware. It contains hydroflouric acid, which is corrosive to skin. However, we are using this feature to dissolve the AR coating on the lens.

Where to buy? - smallest size, thus cheapest I can find.