If you are looking for a way to clean pumice stone, there are a few things you can do. First, make sure that the pumice stone is clean and free of any debris. Next, pour a small amount of vinegar onto the pumice stone and use a cloth or sponge to suction onto the top of the vinegar. Let the vinegar work its way into the pumice stone and then use a scrubber or brush to remove all of the debris.