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Nobody's Right if Everybody's Wrong
on September 17, 2013
Contrary to what some people were apparently expecting, this is not fairy dust.
Now yes, the makers seem to claim that it is, and this is either allowable commercial flummery or, if you'd prefer, lying. Take your pick.
Now that we have that out of the way, please consider:
Nothing cleans anything by making the dirt vanish. The dirt has to go somewhere. So while the makers say it "cleans" grout it of course does no such thing. It does make it LOOK clean, but only by placing a layer of what amounts to paint over the dirt.
HOWEVER, this is not to say that you shouldn't buy this stuff. I've been using it, or one of the many other very similar products (and they're all about the same) for years with good success.
So here's the secret you don't want to hear: if you want this stuff to work, you have to at least take a stab at cleaning the grout first.
Your floor, particularly in kitchens, is covered with very fine particles of dirt and a thin layer of grease. It just is. And no paint or coloring or anything else will adhere to it.
Some people grab this stuff, slap it down on top of ten years worth of dirt and grease and then are shocked - SHOCKED - that it flakes up.
"But they said it was a cleaner too" is no excuse. Simple common sense tells you otherwise.
Clean the grout, It's a crummy job, tedious and time consuming. Then this stuff will stick to the existing grout just fine.
Then - and again, the makers specifically say that you don't need to do this, either - go to your local hardware store and get a small bottle of grout sealer. All you need is a few minutes and a small paintbrush. Swipe on a thin layer of the stuff, it will seal it and help it repel dirt. For a while.
Is it perfect? Not in the least. And the white in particular is a brilliant snow white, which may not be what you want, although I've found that if you purposely lay it on a little thin you get better texture and less brightness.
After stuff like this, there is really only one alternative: grind out the old grout and replace it.