question about groutmaster on natural stone tile ?

nbaabc1234

Member
Jan 25, 2019
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Real Name
NICK
The attached picture is below. Recently, I was cleaning the customer's natural stone floor with Groutmaster . I don't know whether it is marble tile or granite tile or something else, please tell me if you guys after seeing the picture. Then rinse with plain water on Turbo Force 12" Hybrid Spinner 800psi ,grout and tile surfaces whiten and clean,

But there is a problem, I found that the luster and reflective degree of the whole ground are not as good as before cleaning, the stone surface becomes Matt, may I ask why, how to remedy?
 

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