If it's a light colored grout, getting it all one color will be a chore and from experience on my end, impossible. I would use a grout dye (found at any tile store). This is a long, tedious process, but the end results are excellent.
To get it lighter, I've used the "Awesome" carpet cleaner spray from the dollar store with great success. To get it darker, mop with coffee (hahahaha, but it would work...); otherwise try a grout cleaner or even a grout paint from home improvement store.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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I have a honed Carrera marble floor in my master bath. Every product I have tried etches the marble (if it works at all) or the grout looks just the same after scrubb...
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How can I clean the grout tiles on my kitchen table. The grout was originally a dark blue. Now it's black. I want to clean the grout, not necessarily give back th dar...
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http://www.practicallyfunctional.com/make-your-own-grout-cleaner/
If it's a light colored grout, getting it all one color will be a chore and from experience on my end, impossible. I would use a grout dye (found at any tile store). This is a long, tedious process, but the end results are excellent.
http://holidaysparkle.blogspot.com/2013/11/grout-cleaner.html?m=1
http://naturehacks.com/house-and-home/how-to-naturally-clean-grout-and-tiles/
buy grout cleaner from Home Depot
https://www.hometalk.com/diy/clean/bathroom/how-to-clean-grout-and-install-new-grout-that-won-t-stain-23803774
How to Clean Grout and Install New Grout That Won't Stain
To get it lighter, I've used the "Awesome" carpet cleaner spray from the dollar store with great success. To get it darker, mop with coffee (hahahaha, but it would work...); otherwise try a grout cleaner or even a grout paint from home improvement store.