by Wayne Bradford
I WORK IN A MIDDLE SCHOOL AND THE GROUT IS BLACK. HOW DO I MIX THE SOLUTION WITH THE AMMONIA, VINEGAR IN A MOP BUCKET TO SLOP THE FLOOR BEFORE SCRUBBING THE GROUT? ITS JUST PLAIN GREY UNFINISHED TILE WITH UN-SANDED GROUT. ONCE CLEANED HOW TO KEEP IT THAT WAY?
Like you said, use a mop bucket to mix the solution. What would really help are some grout brushes to scrub the grout lines.
I would also let the solution sit for at least ten minutes, before scrubbing.
You may need some stronger chemicals if these homemade remedies won't work.
Try our Stone, Tile and Grout Cleaner. It works great for cleaning grout. Sometimes the home remedies just don't cut it.
I hope this helps.