Question:
I accidentally bought non kosher ice cream and used a spoon (don't even remember which)
Answer:
If the ice cream only contacted the spoon when the spoon was cold, i.e. it wasn't washed in hot water, then all you have to do is ash the spoon off with soap in water that isn't hot.
Additional reading:
- Can one kasher the glass lid of a stainless steel pot?
- Kashering kalim and small appliances that were previously owned by a non-Jew...
- Is toiveling necessary after kashering?
- Burying treif items in the ground for three days
- using dairy fork to eat meat
- Can you kasher a second hand espresso machine?
- Kashering metal dish rack