What s this stuff coming out of cracks in a coffee cup?
I bought a coffee mug from walmart. There was a chemical odor coming from it no matter what I tried, even baking soda and vinegar didn t get rid of it. After using the baking soda and vinegar some kind of white sandy stuff started coming out of micro cracks in the cup (which is where I think the smell is coming from). It s white and crumbly like sand. After each wash with bleach the white stuff appears again. What could this stuff be?