Averages are for Corvallis Municipal, which is 5 miles from Corvallis.
Warnings. Do not use pumice stones to clean marble, laminate, plastic or fiberglass toilets; doing so will result in permanent scratches. A dry pumice stone will also scratch porcelain, so be sure to keep the stone and the toilet surface wet at all times.lean With a Pumice Stone. Before cleaning a porcelain toilet with a pumice stone, you must thoroughly wet both the stone and the surface to be cleaned and keep the stone and the surface wet as you work.
Before using the pumice stone, clean the stained area thoroughly by spraying it with undiluted vinegar and then rubbing it with a scrub brush. Do not use bleach on the stain. Then, wet the pumice stone and test it on the stained surface by rubbing gently in one small area and then checking for any scratches.urprisingly, they are also great for cleaning your bathroom or kitchen. If you have stains or mineral deposits on your stove, bathtub or toilet bowl and they cannot be removed by any other means, such as with an acid-based cleaner or with vinegar, then try removing them with a pumice stone.