What can I use to clean the grout of my Floor tile?

Make a paste with hydrogen peroxide and baking soda....apply to the grout and let sit a couple of minutes. Scrub lightly with a small brush then rinse with clear water thoroughly. Should help remove stubborn staining.

I have been there and done that :) I learned from a tile installer how to clean my tiles and I have been SO happy with the results. Mix a ratio of 1:10 vinegar:water in a bucket. Use a deck brush to gently scrub the floor and grout with the vinegar water mixture. Once you have the whole floor scrubbed, mop it up with a warm water rinse. My grout and tile cleaned right up and I've been cleaning my tiles floors this way for 12 years :)

Here's how I clean our tiled floors with white grout. I have a brush that is made for cleaning tile. It's 10" long and about 1.5" wide and the stiff bristles come to a peak in the center. An extension pole screws into the head so I spray bathroom shower cleanser with bleech on the grout first. Then I stand with my extension pole on my brush and work the cleaner back and forth in the grout and ten go on to the next area. When I have the area grout all brushed I wash the area with a sponge mop and soap and water. I usually do a double wash and mop. I got my brush and extension on Amazon. I do this once a month and our white grout stays looking new. We have two dogs who drag in mud etc but when I clean the grout I keep them In another room and close the door. Good luck

Use majic erasers takes time but it's fast and clean!!!

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I just finished cleaning my tile. I mixed equal parts of white vinegar, bottled lemon juice, dawn dish detergent, and baking soda. You have to use a large container to mix because the baking soda really makes it fizz up and over a smaller container. Stir very slowly with a spoon so it does not fizz more. I put it on with stiff grout brush. Let it sit for a minute or two. Then I scrubbed some more with the grout brush. Finally, I washed it down with water. You can put some vinegar in the rinse water which helps cut the suds. This solution can make the floor slippery because of the dawn, so be careful if you have to walk across it. Finally, after making sure floor was dry, I put a sealer on the grout. I sat on a low child's chair and just leaned over and painted the sealer on. Just moved the chair back as I worked. This was much easier than working on hands and knees. Because we had never sealed our tile after installing it, our grout was pretty black. I never thought we could get it back to it's original color, but we did. This mixture even worked better than a tile cleaner I had bought. Good luck.