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 stone is a light porous acid volcanic rock having the composition of rhyolite, used for scouring &, in powdered form, as an abrasive & for polishing. report this answer. Updated on Monday, February 06 2012 at 08:30AM EST. Source: dictionary.reference.com/...umice stone is a light porous acid volcanic rock having the composition of rhyolite, used for scouring &, in powdered form, as an abrasive & for polishing. report this answer. Updated on Monday, February 06 2012 at 08:30AM EST. Source: dictionary.reference.com/...