Pareve sponge used to wash meat spoon which had been used cold to scoop an avocado - is the sponge fleishig?

Question:

I used a pareve sponge to wash a meat spoon which hadn’t been used for meat within the past day and that I used (cold) to scoop an avocado. Is the sponge fleishig now?

Answer:

Since the spoon didn't have any residue of meat on it, it is still pareve.: