On Jan 19, 9:06 pm, Nate Nagel wrote:
I just scraped up a whole mess
of cheapass vinyl tile from my laundry room floor, and I'd like to
simply clean the concrete and leave as is. What product should I use?

Tough to say without seeing it. Google muriatic acid. It can be
diluted to fit the task, you might get away with as little as a 2%
solution.
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- gpsman