Spray or apply the solution onto the window starting in the top left corner and ending in top bottom right corner. Working in the same pattern, use a wet scrubbing pad to remove the dirt. If it is hard to reach the corners with the pad, try an old small brush to remove the dirt. When the windows were really dirty, rinse the windows with clean water before you wipe and dry the glass with the squeegee. Then use the microfibre cloth to wipe and dry the frames and corners.