![Not sure if this is the correct place to post. What is this black stuff from my coffee mug? Doesn't come off with soap or anything. : r/CleaningTips Not sure if this is the correct place to post. What is this black stuff from my coffee mug? Doesn't come off with soap or anything. : r/CleaningTips](https://preview.redd.it/not-sure-if-this-is-the-correct-place-to-post-what-is-this-v0-lkl8c1mmqa4c1.jpg?width=1080&crop=smart&auto=webp&s=ace44731ea4bb431c74022e0070110e52a78d36c)
Not sure if this is the correct place to post. What is this black stuff from my coffee mug? Doesn't come off with soap or anything. : r/CleaningTips
Why do I get swirly marks in the bottom of cups & mugs that have been in the dishwasher? They look like pencil marks. How can I prevent it? Anyone have the
![Any tips on removing this stains of coffee & tea from mugs? Tried washing by hand, baking soda + vinegar and they're still there : r/CleaningTips Any tips on removing this stains of coffee & tea from mugs? Tried washing by hand, baking soda + vinegar and they're still there : r/CleaningTips](https://preview.redd.it/any-tips-on-removing-this-stains-of-coffee-tea-from-mugs-v0-1ucj3bmygtv91.jpg?width=1080&crop=smart&auto=webp&s=6c89f6ca189847d8ec53597b0c0de4b5e37fb1f1)