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The empty blue cup is on the dirty table and there is a teaspoon. Cup marks, coffee stains on the surface. Close up picture Stock Photo - Alamy
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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 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://i.redd.it/not-sure-if-this-is-the-correct-place-to-post-what-is-this-v0-hj4fk0mmqa4c1.jpg?width=3024&format=pjpg&auto=webp&s=40e47e2aa7416c7b4209b8a50ba3ff01de134b65)
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
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Ceramic mug,coffee mark cup,European Ceramic Coffee Mug with Spoon, Ceramic Cup with Saucer, Porcelain Coffee Mug with Handle, for Office Kitchen-b-200ml 7oz (Color : E, Size : 200ml 7oz) : Amazon.co.uk: Home
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1pc Ceramic Mark Cup With Spoon And Lid, Coffee Cup For Ladies, Suitable For Home And Office Use | SHEIN UK
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