Removes soap scum, lime & rust build-up. No harsh fumes or chemicals. A smarter way to clean! EarthStone has reinvented heavy-duty cleaning. Now you can tackle tough jobs without harsh chemicals and fumes. This effective, non-toxic cleaner is made from 98% recycled glass that is refined and foamed into a block, reducing landfill waste. It’s a smarter way to quickly and easily remove soap scum, grime, hard water build-up and rust stains. Finally, powerful non-toxic cleaning!