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Removing paint from a wall is all but impossible without destroying the finish on the wall. You didn't say how you screwed up, so I can't offer a solution.

Ok I live in a trailer home and when I got the house they had already painted over the typical "wallpapered trailer walls" anyways I need help I screwed up massively I don't have anymore money to purchase anything else I need to know how I can remove just the layer of paint I painted without removing the original paint underneath plus I also got paint on the floor and stuff please help me I feel like an idiot :(!