Get rid of dried puffy paint on a wall by first scraping off as much as you can with a plastic gift card or even the bowl of a plastic spoon. Wet the paint to soften it, then scrape more away.
The Cleanup Process
Puffy paint is water-soluble, so it may be easy to remove from the wall without using harsh chemicals.
Pick and Scrape
Pick at an edge of the puffy paint with a fingernail, or jam the edge of a paint scraper underneath it if the paint feels too hard to pick off without a tool. If the paint is somewhat soft, scrape it from the edge toward the center with the edge of a plastic gift card or the bowl of a plastic spoon.
Rub a nylon scrub brush over the area to remove loose paint particles if the remaining puffy paint feels crumbly and falls off easily.
Wipe any remaining paint residue with a damp white cloth, or with the wet tip of a cotton swab, if the puffy paint covers only a thin area. Allow the water to soften the paint a bit.
Scrape It Again
Scrape away remaining paint with the edge of a plastic gift card or bowl of a plastic spoon. Brush it again to help remove loosened particles.
Use a Citrus Cleaner
Dab a citrus-based solvent over the remaining paint residue with a cotton swab. Wipe the area with a damp cloth after several minutes. Use a solvent only on painted, sealed or nonporous wall surfaces
Erase the Spot
Rub the area with a damp corner of a melamine foam eraser designed for stain removal. Continue erasing until no more puffy paint remains.