Get Tea Stains out of Cups
If the stains are tough enough to survive a baking soda assault, it’s time to call in the cavalry: white vinegar. Fill the cup with equal parts vinegar and hot water, then let it sit for 15 minutes. Your kitchen will smell like a pickle factory exploded, but that’s the scent of progress.
Pro tip: don’t try this trick on a date or before a job interview—unless you want to explain why your breath now double-dip as salad dressing. After the soak, rinse thoroughly and marvel at the ghost of stains past. For extra drama, add a pinch of salt to the vinegar solution; it creates a fizzy reaction that feels like a tiny science fair in your sink.