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.
Pumice is a type of extrusive igneous rock, formed from high silica lava which is explosively erupted from volcanoes.umice stone a highly abrasive material and because of this it is  commonly used to get rid of any calluses or dry skin from the heel  and the base of the foot. In ancient t â¦ imes, however, pumices stone  was also used by Roman and Greek cultures to get rid of excess hair  from the body.