Baking soda is better than any cleaner for cleaning baths and sinks.
1/3 cup of cheap white vinegar, 1/3 cup of non-sudsy ammonia (preferably the yellow colour) and 1/3 cup rubbing alcohol. Mix in a spray bottle and top of with water. If you buy large containers of each ingredient this cuts costs even more.
Baking soda is better than any cleaner for cleaning baths and sinks.