Toilet Cleaning: Remove Black Stains from the Bottom of the Toilet with Grandma’s Trick! Ingredients: Baking soda (about 1 cup) White vinegar (1 cup) Toilet brush Instructions: � Sprinkle baking soda generously around the bottom of the toilet bowl where the black stains are. � Pour white vinegar over the baking soda. You’ll see fizzing—that’s the magic working! � Let the mixture sit for 10–15 minutes to break down stains and grime. � Scrub the stained areas with a toilet brush. � Flush to rinse