And the wash basin smells terrible. The odor won't go away.
I once had a tall, 5 gallon beautifully decorated “gray and blue” stoneware churn that must have been used for years n’ years for making kraut or pickling corn, beans, etc. because after I had washed it and sat in my shop it would “weep” enough salt out on the surface to form a “white” coating which I would have to wipe off with a damp cloth every couple weeks or so.
Anyway, .... unglazed, poorly glazed or "worn-off-glaze" pottery is very porous, thus your pieces might require a washing in bleach, a “gentle” trip thru the dishwasher or a “sealer” to keep them from “stinking”.