There is a product called Grout Shield that will do this. I used it to MATCH existing grout and we were very happy with the result. Not to difficult to apply, I did our entire house including both bathrooms in 2 weeks 2 to 3 hours at a time, moving furniture as needed. The cost was very low, around $60 per kit, I bought 2 and only needed one.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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