TheSlinger
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https://homeguides.sfgate.com/remove-ceramic-tile-glue-wall-38339.html
"Apply some water to a small section of the adhesive. If the adhesive used was organic mastic, the water will begin to soften it, allowing you to scrape it off. If a tougher adhesive was used, water will not be effective; test only a small area to avoid potentially wasting your time. "
