Things You Will Need
The most effective remedy is to remove the stain immediately before it has time to set on the surface. If this is not possible, you can still remove the coffee stain.
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Set up a ladder beneath the coffee-stained area of your ceiling. Have someone hold the ladder to keep it secure while you're removing the stain.
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Mix 1 cup of ammonia with 1 gallon of warm water. Place rubber gloves on your hands to prevent your skin from drying out due to the ammonia solution.
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Soak a clean cloth in the ammonia solution and squeeze out excess liquid. Scrub the coffee stain on your ceiling gently, so the stain is removed and not any of the paint. Brush the stain with an old toothbrush dipped in the ammonia solution if the stain is difficult to remove.
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Spray all-purpose cleaning spray on your ceiling at the site of the coffee stain. Wipe with a clean cloth to wash off any remaining coffee stain as well as the ammonia solution. Dry with a clean cloth.