Typically, there’s a small sticker on the glass indicating which side has Spot Guard.
If the sticker has been removed or you are unsure, place a few drops of water on the surface. If the water beads up into small droplets, it's coated.
Important: Spot Guard is not a safety film. It is a factory-applied coating designed to help reduce water stains, soap scum, and limescale buildup, making the glass easier to clean and maintain.