Your going to need to use an acid based cleaner. I would recommend Prosco Masonry Clea
John E Freitag

John E Freitag
Owner/Director
The Stone & Tile School
Office 407-567-7680
Cell 407-615-0134

www.thestoneandtileschool.com

ner  600 dilute more than recommended , be sure to wear safety glasses and rubber gloves. Apply with a sponge do not spray.
Allow dwell time with a scraper , then brush vac rinse , this will probably take two applications , after the acid then clean with a neutral cleaner to neutralize the surface. This will work on the porcelain and the slate. If the slate need  more attention you can use a honing powder or honing pad to remove the remainder and give a new honed surface to the slate. When completed seal with an impregnating sealer or to enhance the color use a color enhancing sealer , solvent based.

-----Original Message-----
From: list-manager@stoneandtilepros.simplelists.com [mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Justin Cameron
Sent: Friday, June 10, 2016 7:22 PM
To: Stone Tile Pros
Subject: Slate and porcelain

Wanting some suggestions on restoring this water feature in a spa. 🙀😬. The walls are porcelain and the bottom ledge is slate. All are really bad hard water damage wondering best way to restore or is it waste of time.
Thanks
Justin

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