Combine 1 ½ cups of distilled white vinegar (simmer the vinegar for about 5 minutes if you want to freshen the carpet while removing the stain) with 2 tablespoons of either standard table salt or sea salt.
Put the lid and nozzle on the spray bottle, and shake vigorously for about 30 seconds.
Spray the stained area on the carpet from no more than 2 feet above or adjacent to it.
Allow the DIY carpet stain spray to sink into the fibers of the carpeting, upholstery, or fabric being treated until it is completely dry to the touch.
You can blot but NOT rub the DIY carpet stain spray recipe during the treatment process if you feel doing so might be necessary to help pull up the stain completely. Never rub a stain, no matter how old it is, because the active natural ingredients in the recipe could then spread the stain instead of lifting it.
Vacuum the carpet to remove the salt after the natural carpet stain spray has dried.