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You could try vinegar, that and a little elbow grease might do it. And if there are tough spots that scrubbing doesn't get rid of, you could try the Magic Eraser--I'm not sure how green it is but at least you're not spraying stuff everywhere with it and it gets up some things that nothing else does.
(from a Tile, Stone, Marble & Granite guy) I know You want "green", but nothing takes the place of good old reliable bleach. Clorox has both lemon and other scents now so that the chlorine is not overpowering (just use tall, like up the arm rubber gloves and keep it off Your clothes, best applied w/a sponge) and the secret(s) to success (from somebody who gets paid big bucks for this) is to get Yourself a "Sonic Scrubber" & the multiple interchangeable heads. Stuff in the batteries, and wipe w/the sponge, then push the button on that scrubber...You won't beleive the results.
Now here's the Real Tip...
So that You NEVER have to clean it again, allow it to dry for 2-3 days minimum after the cleaning, head to lowe's/home depot/any tile supplier, & pick Yourself up a small bottle of "Grout Sealer". You can even re-use the former sponge, wipe it on liberally until You see the grout change color (soaking it in). Wait a half hour after You complete the last section & wipe the TILE to remove the excess sealer. Repeat again the Next Day. Finito.
& You will never need to scrub her grout again. Once Sealed, the grout will NOT Accept Moisture (the food of Your mold).
Hoping this helped,
-Snoopysdad
I don't have a problem with bath grout, but do have tile floors in most of my house. The grout is very dirty. I have tried several grout cleaners as well as bleach. Nothing is cleaning the sucker. Any suggestions? Marla
When you tried bleach, did you let it sit for a little bit or did you rinse it off right away? Sometimes it takes a little time for it to bleach the stuff out. Depending on what the dirt is sometimes you also need to scrub at it with a toothbrush or something along those lines in order to get the dirt out.
I let it set and used a toothbrush. The grout was dirty when we bought the house. Not sure what was the cause of the stuff. There are companies that clean grout, not sure I want to use them.
Maybe the tile grout was dyed by the previous homeowners. My SIL dyed her own grout and after about 8 years if always looked like it was dirty. We re-dyed it and it looks perfect.
Maybe you could pick a color that you like and grout it a new color?
If it's really bad ground in dirt from years of not being cleaned then there may not be much you can do, if it gets way deep in the grout then it's not going to come out. I think a lot of those grout pros just recolor the grout back to white/light color, I don't know that they actually clean it and you can recolor it yourself if you don't want to pay them to do it.