Removes tough stains. Use on: toilets; shower tiles; bathtubs; sinks. Removes: hard water stains; mineral build-up; rust; soap scum; limescale. Safe on porcelain and ceramic surfaces. Non-toxic, chemical-free cleaning. Clorox Bath Cleaning Stone provides effective and safe cleaning for most bath surfaces while contributing to a cleaner environment. Our Bath Cleaning Stone products are made form recycled materials and each block saves the equivalent of one glass bottle from being added to landfills. Clorox - committed to helping you achieve a cleaner and healthier home. Customer Support: Toll-Free: 1-800-320-8045 9 am-5 pm EST. Discover more tools that keep your home happy and healthy at www.cloroxtools.com. Assembled in Mexico. Made in the USA.