TMF Hard Surface Specialist
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I have a few accounts, color sealed with GP, that I clean monthly and so far (knock on wood) they CS is still intact. I only clean these @ 600 psi though. They clean up great, with the GP on them, so I have never needed to increase the PSI. BTW I do not agitate the grout lines with a grout brush but it is not needed anyway. You also need to let the jani crew know that they are to only use a neutral cleaner for day to day cleaning. I would let the owners/manager know as well. Tell them they are doing more harm than good with the way they are maintaining the floors.
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