Thanks for responding, Doug. I thought that it may just be that it is the abrasive as well. I have tried each vinegar and baking soda just on its own with a wet cloth or scrub brush but they don’t work as well as when I sprinkle the b.s. on first and then spray the vinegar over that and then scrub right away. Maybe it’s the timing? Like you said, something about the bubbles? I understand about the alkaline vs. the acid and that they sort of cancel each other out. So what you said makes sense to me. I was just wondering how it then does such a good job of getting rid of the bathtub ring and making it all shiny! Hehe! I like understanding how my cleaners work, since I make them mostly at home and it helps to know these things for coming up with new recipes ,etc.
Thanks again for responding to my somewhat silly question! : )