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Unit 4 Shift Test
Your decision
A marble bathroom has a tough stain. The acid cleaner isn't shifting it, and a colleague says, “Add some bleach — together they'll be stronger.” What do you do?
Refuse to mix anything. Switch to a neutral cleaner that is safe for marble, use it on its own, and open a window for air.
Add the bleach to the acid to make it stronger.
Scrub harder with an abrasive pad until it lifts.
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