I use about 1 cup of vinegar to a gallon of water. Any Vinegar is good for the rinse but I do use the Organic Apple Cider Vinegar made by Bragg (with the mother on the label). If you plan on putting the vinegar in the drinking water only use the organic ACV preferably by Bragg. I use the Vinegar rinse as the final rinse and I do leave it on for a few minutes before drying. This does prevent the "wet doggy smell" and their fur is soft and shiny.