Robert Buckle wrote:
>
> I am looking for info on cleaning slate. Slate is being removed from a
> collapsed building. It is to be reused on  an adjacent building. It has
> some staining - white which may be a salt. The roof is near the ocean. The
> slate appear to be in good condition other than some staining. A chemical
> cleaner was recommend but I think this may not be required.  From local
> sources it appears the slate was installed in the 40s (second roof of a
> 1907 wood frame builing...poorly constructed. Slate is attached with
> galvanized roofing nails.
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        http://www.prginc.com/pub-index/maintenance.html#CHE001