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Old 02-12-2018, 06:12 PM   #8
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 12,039
You want to avoid gouging the plywood and making the surface as even as possible...lumps or humps of leftover thinset will make setting new tile tougher, especially if they're larger format. A rubbing brick can help with stuff that does not scrape up. Depends on what was used how easy it will be.

Some of the Noble membranes can be installed with an adhesive verses thinset. IF they used that, you probably wont' have a lot of crud left except for some fleece, which shouldn't be a problem.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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