I'm so relieved. We found a solution to this unpleasant grout problem (read all about it here... or catch the short version right here).
We were ready to have away with this linoleum and install new porcelain tile.
But we groaned when we saw our charcoal grey grout turn white.
I Googled the problem and found out it's quite common. There is a small chance it was the manufacturer's fault, but most likely we were either too generous with water when preparing the grout mixture OR too much moisture was applied with a sponge when the grout was set.
Either way, we felt stuck... especially since I had already sealed the grout. And during my search on the web I read that if the grout has been sealed we may need to remove the grout and start from scratch... sigh.
So my very patient handyman called the manufacturer of our grout and they recommended we give this a try -- Sulfamic Acid Cleaner.
We found this acid cleaner at our local Home Depot, and we followed the directions to simply add water. We scrubbed the solution between the tiles with an old toothbrush. And to our pleasant surprise...
We're pleased with the results.
The grout stayed a dark grey after drying... phew.
Unlike our vinegar and water solution that we applied to the grout, where the grout dried white. This vinegar solution could work for you if you're experiencing a similar problem. I'm guessing it didn't work for us because I had sealed the grout.
Now we're on to more construction... and while our floor rocks, the rest of our bathroom not-so-much.
But we're making serious progress. This weekend we bought paint and the handyman prepped the walls by removing the towel bars, filling in holes, and scraping loose paint.
We're close to crossing out more of this list and we can't wait to show you it all: