I see more grout issues in newer homes. I see grout that has more staining issues. maybe because of the reason above or using cheap grout. What I tell people now is that my cleaning process will remove dirt, grease, oil and other soiling but will not remove staining. I also advise that my cleaning process should not remove grout unless there was improper installation.
When I started my business, I cleaned at 1000 PSI, then lowered to 900 then 800. Now I clean at 500 PSI. I spray the floor, agitate with a grout brush and deck brush. At 500 PSI, I rarely have grout chip issues unless there was improper installation.
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