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Unread 07-14-2009, 03:58 PM   #9
Stone Dude
Registered User
Join Date: Jul 2009
Location: Southern California
Posts: 897
grout haze cleaner is acidic.

before you use something like this on slate you need to TEST.

SOME slate is acid sensitive and some is not. do test to determine which you have. if it comes out to be NON acid sensitive then grout haze remove would be acceptable. However if your slate does react to acid, then i would recommend against using a haze remover.

you can use a scraper carefully to pop off big chunks and a stiff nylon (not wire) brush to scrub the lighter areas.
Cameron DeMille

MilleStone Marble and Tile Inc.
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