Convert Mason Jars into a container with a pour spout. Cut the top off an empty cardboard salt container to the size of the canning lid on your jar (use it in place of the lid). Use the canning ring to screw it in place.
How to whiten yellow shirt stains: Mix together 1 tbsp Dawn dish washing liquid, 2 tbsp hydrogen peroxide, and 2 tsp baking soda. Apply the mixture to the yellow area and scrub gently. Leave sit for two hours and launder as usual.