Okay, I'll start by saying this: I'm the type of person that never writes reviews. Yep, I'm one of those. Sure, I'll rate but very very rarely am I ever moved to actually WRITE a review. Well, this stuff moved me. Truly. But why? This absolute gem of a cleaning product completely K-O'd what I've dubbed the "Impossible Grout" on our white, tiled bathroom floor. I'd made numerous vain attempts to handle it over the years (without resorting to bleach) but I just couldn't get it to go away. This stuff was not budging. I'm talking like a decade or longer's worth of... nasty. Dirt and God knows what else. I suspect it hadn't been *properly* cleaned since the late Lady of the House (may she rest in peace!) was still taking care of business which was more than a decade's worth of moons ago. That's a whole lotta moons and this was a whole lotta... yuck. You get the idea. So... earlier this afternoon I put my freshly delivered Pink Stuff to the test. I mean I opened that package with a quickness, snapped the tab on the seal, popped that lid off, and threw a bit of caution into the wind. I remained cautiously optimistic. Outfitted with my extremely necessary vinyl cleaning gloves, a sponge, scrub brush, and my SHEER TYRANNY OF WILL, I went to town. I mean I took a big ol' GOB of Pink Stuff and smeared it ALL OVER that offensively filthy floor. I further spread it with a soaking wet rag. I scrubbed the absolute everlovin' heck out of that floor with every ounce of energy that I had. I literally scrubbed 'til I could scrub no longer. Hands & knees, Cinderella-style (though she made it beautiful, I was a frizzy, sweaty mess personally). I could see the ground-in, dark funk finally starting to break up and away. The grout, while not sparkling white by any means, was finally visible. Discolored of course, but visible. I was gobsmacked. Once I evenly distributed the 'Stuff whilst simultaneously scrubbing my heart out, I took a clean, wet rag and started to wipe the pink-turned-greige away. Wash, rinse, and repeat. After a number of passes, I got it cleaned up right up. It was like night and day. Now it wasn't a perfectly pristine white like most folks would hope for but it was definitely CLEAN. I definitely wouldn't eat off of it but I'm pretty dang proud of what this miracle product made possible. Now because I was FINALLY able to get past the schmutz of years long since passed, I could use a bit of hydrogen peroxide (which just didn't work previously) to help brighten things up further. I'm sold. A+++++++, infinite gold stars, and a million high-fives! Well done! p.s. Is there a way I could arrange to buy this by the truckload? ????