whether it’s used as flooring, in the kitchen as a backsplash or for counters, or in the bathroom — has one great downfall: grout. Since grout is porous in nature, unsealed grout absorbs all kinds of stains, from mildew to coffee and everything in between. To say it’s a headache to keep grout clean is an understatement.
Note: Be wary of using too much lemon juice with marble, since it can etch or damage the stone if left on too long. Hydrogen peroxide can be a safe alternative.
Meg Padgett
We inherited marble tile counters when we purchased our home. It’s pretty clear that the grout was never properly sealed, so it soaks up stains like crazy. It makes our kitchen feel gross and grimy, even if it was just cleaned. While I’d love to replace the counters with a solid surface like quartz, it’s just not in our budget — plus, we just can’t justify getting rid of something that’s perfectly fine otherwise.
Read more at: http://www.houzz.com/ideabooks/10814147/list/Get-Grout-Magically-Clean—–Stains-and-All