Roger, are you using an hard surface extractor? I would never do one of these without it. On new gray grout, forget about it, even with an extractor. I would definitely pre-seal the grout almost any time it is new grout. I once had this problem and had to remove/replace all the grout, nightmare, never did get paid, only time I never got paid. Ouch.

 

 

With a lot of limestone in homes or other honed surfaces, we frequently use honing powders. No matter how thorough we are in cleaning the grout lines, some always end up with some grout lighter or different color from the rest of grout.  Why is this? What can be done to prevent or correct this problem?   Thanks, RK

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