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.
1. Spray the stones with a vinegar and water solution. Scrub the surface with a stiff-bristle scrub brush. Vinegar won't harm the surface of the stone, whereas commercially available products might.Lay towels underneath the fireplace to catch any dripping water.. Spray the stones with a vinegar and water solution. Scrub the surface with a stiff-bristle scrub brush. Vinegar won't harm the surface of the stone, whereas commercially available products might.