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.
Clean very tough stains with a pumice stone. This is recommended for tougher stains when scrubbing. 1  Be sure your tub is porcelain when using a pumice stone. 2  Acrylic and enamel bathtubs should NOT have pumice stone applied to them.3  It will mar the surface with scratches.lean very tough stains with a pumice stone. This is recommended for tougher stains when scrubbing. 1  Be sure your tub is porcelain when using a pumice stone. 2  Acrylic and enamel bathtubs should NOT have pumice stone applied to them. 3  It will mar the surface with scratches.