What can I do to restore the slate

What can I do to restore the slate Images

What can I do to restore the slate

What can I do to restore the slate Description

I just bought a house with a slate shower and (http://maplered.com) when it is dry the slate has a whitish color to it. When its wet it looks new. I've tried all types of cleaning solutions and (http://maplered.com) none of them make any difference. What can I do to restore the slate and (http://maplered.com) then seal it to keep its beauty.
 
Thanks:
Steve.

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