Scrub Bowl with Toilet Brush

What happens here

Take the toilet brush and begin to vigorously scrub the entire interior surface of the toilet bowl. Focus on the areas where the baking soda and vinegar mixture has been working, paying special attention to the water line, any remaining discolored spots, and particularly under the rim and inside the flush holes (referred to as 'port holes' in the video). The mechanical action of the brush, combined with the chemical reaction of the cleaning agents, will effectively lift and remove the stubborn stains. The video clearly shows a dramatic difference between a scrubbed and unscrubbed section of the bowl.

Goal: Using a toilet brush, vigorously scrub all interior surfaces of the toilet bowl, including under the rim and the flush holes, to remove loosened stains.