hihi, although baking soda works for SD, the amount of dosage is hard to measure!
since i get a very dry skin, using baking soda worses the problem!
so i suggest you that you may try the honey treatment instead of baking soda treatment.
since u've used baking soda for few days or a week, part of yeast has been killed. so you can just continously use honey instead of baking soda to kill the remaining yeast!