Inspired by the many uses I've already read about and tried for baking soda, I decided to see if it was up to the challenge of the soap scum in my bath tub. I must confess, scrubbing the soap scum out my bath tub is one of the lowest priorities in my world. I guess I've always rationalized that it was clean dirt.
I made a paste out of baking soda and water. I spread this in a thin layer over the bottom of the tub and let it sit for the day. I'm not sure if this was a necessary part of the process but we were going out to the beach anyway so it fit right in.
When I got back home, I filled a cup with vinegar and working from the part of the tub farthest away from the drain, began pouring a little vinegar onto the baking soda paste. I followed each pour with a little scrubbing with a scrub brush. The scrubbing effort was very minimal and within 10 minutes, the tub was gleaming white!