I have a ceramic mug which may have been used for a non-kosher hot beverage. I'm really not sure, I'm thinking I used it for coffee made at my parents' house a while back, though I'm not entirely sure. If it was used for coffee, I'm pretty sure that the creamer I used was, in fact, kosher, but I'm not sure as to the coffee. It was made in my parents' coffee machine, and they definitely don't keep kosher. It's been at least a year since I last used it.
- Can I assume that it's kosher?
- If not, can I kasher it?