tile and grout cleaning

https://professionalgroutsealinghaven.ironwoodscope.com/posts/why-professional-grout-sealing-matters-for-your-tile-floors

After a few months, even the most careful cleaning can leave tile and grout looking dingy. I finally tackled my kitchen backsplash last weekend, mixing a baking soda paste with a stiff brush to scrub the grout lines. It took some elbow grease, but the difference was night and day—the white grout actually looks white again, and the tiles have their original shine back without any harsh chemical smell.