Even with regular floor mopping, shower wall scrubbing and countertop cleaning, tile grout inevitably gets filthy. This homemade grout-cleaning solution can get rid of those grout stains with less elbow grease than you might expect.
The powerful combo: equal parts white vinegar and Dawn dish soap. Jo-Anna on A Pretty Life in the Suburbs recommends heating the cup of vinegar for one minute in the microwave, then mixing in the soap. Spray on your grout lines, let sit for a few minutes, then scrub before wiping off with a wet cloth.
(Unfortunately, we're all still waiting on a completely no-scrub solution, but this one helps lift up the dirt thanks in large part to the acidic powers of vinegar. You can learn more about the science of dirty tile grout at Mother Nature Network.)
Hit up the link below for more details and tips on cleaning gross grout without breaking your back.
Easy Floor Tile Grout Cleaner [A Pretty Life in the Suburbs]