(1) Soda cleaning method: It can be cleaned with heated rice vinegar or soaked in baking soda for a day and night, then brushed with a toothbrush. (2) Rubbing with sponge and salt can easily remove the scale or tea stain on the glass.   (3) In addition to small scales, the glass can be immersed in a solution of bleach or cleaning powder and left for one night to remove scale.   (4) Scrub with toothpaste or broken egg shell, then rinse with water.   (5) Potato cleaning method: first prepare the hot water, then take a potato and crush it, put it in the cup, pour the prepared heat into the cup for 10 minutes, then it can be easy. Wash off the scale on the cup. The principle is that there is starch in the potatoes. These starches have a strong absorbency, so it is easy to remove the dirt in the cup. item details Name: Coffee Glass Size: 15*8.8cm Caliber: 8.8cm Capacity: 400ml Material: cup cover PP, cup glass, cup cover PP, spoon PC Color: black, coffee, gray, white, blue, lake green, pink, purple Box gauge: 1*60