Looks like bluestone to me. We clean with alkaline and or an acid.
Mason guys use muriatic we don't like to.
I never seal them when their outside .

On May 8, 2012 10:34 AM, "Roger Konarski" <qm144@yahoo.com> wrote:
I'm not an outdoor slate person, so I need help on this one. Please see attached picture. The picture is the outdoor slate but they also have the same stone in a screened in porch. What product should I use to clean with, using my floor machine? 2nd question what should I seal it with? 
 
Thanks,
RK

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