Glass polish solves problems a standard cleaner cannot touch. White spots from limescale, baked-on road salt, light scratches from dirty wipers: a mild glass polish with abrasives removes them without damaging the glass. Anti-fog does the opposite: it applies a hydrophilic layer to the interior screen that spreads moisture into a thin film so the glass stops fogging up.

Both products target different problems but complement each other well. Polish the exterior to free it from wear, then treat the interior screen with anti-fog for a fog-free winter. Never use glass polish on paint, plastic or rubber, only on glass.