How much salt and baking soda should I put in water to treat a nail infection?

I have a nail infection and went to the urgent care yesterday to clean it.

The doctor there cleaned it and cut something (I don't know, I didn't look) and then put gauze around it with betadine.

Now it's the next day and I have to change the gauze but it's stuck. I have to put my finger in said and baking soda water. But I don't know how much to put. Also should I put it with the bandage on till it's soft so I can take it off without ripping my skin off?
How much salt and baking soda should I put in water to treat a nail infection?
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