Zep ZU104632 Grout Cleaner and Whitener, 1 qt Package, Liquid, Characteristic, Light Yellow

Grout cleaner and whitener cleans even the dirtiest grout lines on kitchen, bathroom and ceramic tile floors with little or no scrubbing. The product also removes rust stains from concrete. Its bleach-free, professional-strength formula makes it safe for use on floors with colored grout.