urine has completely dried.

i used white vinegar on the dried stain and removed the stain and most of the odor. some odor still remains so i am going to do another application.

after the next vinegar application, WHEN do i use the baking soda? Do i use the baking soda while the vinegar is still wet/damp on the mattress…or when the vinegar has completely dried?

do i just sprinkle the baking soda powder on or do i make a paste?