If your grout was never sealed, you will probably find that you will need to have all of the grout done. i cannot recommend anyone as i did ours (whole house) myself, cleaned, and sealed witha product called Grout Shield. This is actually a colored sealant, and I ordered it to match the original grout color. That was a few years ago, still looks good today with regular floor cleaning.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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