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.
Baking soda is mildly abrasive and it can be used to polish small scratches in fiberglass or porcelain bathtubs. To use it, combine enough water with baking soda to make a thick paste. Rub the paste into the bathtub to remove the scratches.anding. Sanding the bathtub with a fine-grit sanding accessory on a rotary tool helps remove deeper nicks and scratches. You can also use a fine-grit sandpaper. Work until the nicks and scratches are gone and finish the job with a buffing wheel to restore the shine.