Make a solution of equal parts distilled vinegar and water. Dump the solution in the container and let it soak for a few hours. When the time’s up, dump out the solution and wash and dry as you normally would.

3. The Sun

What better natural cleaner is there than the sun?! Rub some lemon juice over the stained container. Then, let the container sit in the sun for a couple of hours. Wash and dry the container as you normally would.