Toilet stains can be stubborn, often caused by hidden mold inside the toilet’s internal cavity. Each flush pushes mold out through tiny jets under the rim, allowing it to grow back repeatedly.

Papa Joe from the Papa Joe Knows YouTube channel offers a simple solution. Just lift the toilet tank lid and pour distilled vinegar into the small cylinder with the thin water hose inside the tank. Vinegar is a natural, inexpensive mold killer.

As the vinegar circulates, it reaches hidden areas and breaks down the mold. Let it sit for about an hour. A quick scrub may be needed, but regular use should prevent the mold from returning.