Cleaning the stains from below the water of your toilet can be a daunting task. If you've used your "regualr product" and still aren't happy with the result, try this simple method.
Step 1: Scrub the bowl below the water line with your toilet brush and regular product, and flush the toilet.
Step 2: Pour approx 3 cups of white vinegar into the bowl and lightly aggitate.
Step 3: Let the water sit for at least 10 mins (overnight if possible).
Step 4: Scrub the bowl again and immediately flush the toilet.