What’s the most effective method to clean tile grout?

Make a paste of baking soda and water and apply it directly to the grout lines. Let it sit for a few minutes. Then, spray white vinegar onto the paste. The mixture will fizz, helping to lift dirt and grime. Scrub the grout lines vigorously with a stiff-bristled brush (an old toothbrush or a dedicated grout brush works well). Rinse the area thoroughly with clean water and wipe dry.

Mix powdered oxygen bleach (like OxiClean) with water according to the product directions to form a paste or solution. Apply it to the grout and let it sit for 15-30 minutes (or as directed). Oxygen bleach is less harsh than chlorine bleach and works by releasing oxygen bubbles that lift stains. Scrub with a brush and rinse thoroughly. Good for tackling mold and mildew stains.

Use a dedicated commercial grout cleaner, available in spray or gel form. These often contain stronger cleaning agents or mild acids. Follow the manufacturer's instructions precisely regarding application, waiting time, scrubbing, rinsing, and safety precautions (like ventilation and gloves). Test in an inconspicuous area first.