Clean Stained Coffee and Tea Cups. Here’s a Haley’s Hints hack to remove unsightly tea or coffee stains from your favorite morning mug so it sparkles like new. If you’re struggling with stained coffee and tea cups, don’t worry! There are several simple and effective solutions to get them sparking clean again. Follow these tips from Haley’s Hints to remove those stubborn stains: 1. Baking Soda Scrub: Make a paste by mixing equal parts baking soda and water. Apply this…