NOLA70124, thank you for your review. We are sorry to hear that you are having an issue with removing dirt from the slip resistant surface. Comet is not a recommended product to clean the tub with as it can create fine grooves in the finish and cause dirt to collect more easily. Under normal use soap and water can be used. For more stubborn stains on the slip resistant surface use powdered Spic'NSpan or BonAmi. Wet the Surface sprinkle the powder and clean with a soft nylon bristle brush and rinse. If you need any further assistance please contact us directly through the American Standard website "Contact Us" located at the bottom of our home page so we can assist you. Sincerely, American Standard Customer Care Tech Team