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You can get a solution to add to the water or use vinegar and dilute the water for spraying the ceiling. Then use an 8 inch knife to scrape off. Once you have it all off then do it for a second time and sand with a sanding pole.
You want to let it dry then prime the ceiling with a primer. I use Sherwin Williams Pro Prime it's water based, no need to apply an oil base primer unless you want to use respirators the rest of the way. I always add a couple squirts of black to the primer so it's gray and you can see imperfections easily. Plus when you spray your texture on you can see your pattern to keep it even.
Mud your imperfections, clean up with a sanding sponge, and start spraying texture on it.
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