That is an amazing "before and after" --really impressive! Can it be used on grout next to marble? And if so, where did you find it? TIA

I did a google search and found a site with this and it says not to use it on stone so NO on the marble floor! I'd try some Bar Keepers Friend and see how that does, I just discovered that and found it worked amazingly on my porcelain sink and had read that it worked great on grout. It's super cheap so it won't hurt to buy some, readily available at most stores like Walmart or the grocery store. I don't know what's in BKF that works so good but Comet and Ajax just plain old don't work like they used to. Makes me want to stock up on the BKF before they take out what works as they have on almost every product made for cleaning.

I have two bottles of BKF left. The active ingredient is oxalic acid. I hope they never stop selling it and never change the flormula. I love it for my stainless kitchen sink! Will try it on my grungy bathroom tile. Love your before and after pics!

Grout 66 contains hydrochloric acid, so I imagine it would work well. I have used Stone Tech Restore, which is urea hydrochoride, and it was incredible.

Here is a link that might be useful: Grout 66 MSDS

I love BKF! That stuff is fantastic. I use it on my SS pots and pans and my sink. Here's a little tip that I have for that. The little Tupperware lids that go on the kids cups, had those when the kids were little, they fit PERFECTLY on the can of BKF and keeps out any moisture from humidity (live in FL, need I say more?) Also good for the bottom so if it gets wet, doesn't rust.

LINDAC, I do need to seal the grout, thanks for the reminder.

graywings, thanks for sharing the ingredients, I knew the way it stunk and sizzles that it had to have some type of acid in it. I'll have to look for the Stone Tech Restore, wonder how it compares in the way it cleans, along with pricing.

I got the Grout 66 when I went to the Daltile Distributor to pick up my tile order. I don't know who else carries it, would think the website would have that info. I don't know if Daltile would sell directly to the consumer, I was going through my tile setter.

It's ALWAYS a good idea to test something you're unsure of in an inconspicuous location JUST in case something doesn't jive.

arkansas girl: thanks for checking that. I do have BKF and love it, just hadn't thought about it for the grout/marble area. I am still trying to get used to what I can use on marble and polished nickel. I think I need to write it down, so I don't forget from one time to next.

I tried it on the ugly yellow hexagon tiles in the half bath. This is from using ONLY the Grout 66, no TSP, bleach or anything else as I tried with other tiles. Not going to waste it (or my energy) as I'm going to be replacing these tiles soon (or so I hope!)

No too bad I must say!!!

That is soooo impressive!! I'm gonna have to find this product and get on my hands and knees.

I am going to look for some too. I have the same one inch tiles that you have in the bathroom, except that mine are all white, along with the grout. I have tried tsp and about everything else, anyone recommended. House was also built in 1968, and we have lived here about a yr and a half. I have been seriously thinking of putting vinyl tile over them, they look so nasty.

cat ky, what happened when you tried the tsp? It did work for me, but this was icing on the cake and what the tsp didn't remove, this has. The bathroom I gutted out had white hexagon tiles with white grout. I didn't find the Grout 66 when I cleaned that grout but the tsp did a great job. Maybe you didn't do it strong enough? Use a good stiff grout brush?

I see someone is selling it on Ebay but no idea how old it is because it mentions it as a previous name which changed.

I suggest if you have a Dal Tile near you to call and see if they carry it, and if so, if they will sell that to you since they normally don't sell to individuals. They may know where to tell you to get it if they can't. Otherwise, call the company, they should be able to tell you who sells the quarts, which is what I bought.

Also, go to your local hair supply store, I went to Sally, and get the applicator bottle with the fine tip and use that to apply it to the grout. Look at the tips, some are cut finer than others. Unfortunately, there's no cap, so whatever you don't use, just dump back in the original bottle.

Here is a link that might be useful: Grout 66

Has anyone seen this in stores?

Bumping this as well, I see it listed on ebay but it is rather expensive with shipping, would rather buy locally if available...

Yes! thank you for this tip. The TSP worked! I wish I took before and after photos but I didn't. I had such grimy grout on my bathroom floor. I mixed 1;10 ratio TSP to water. I did have to scrub but it really worked. I used just a generic scrub brush and it seemed to do the trick.