Wipe the fingernail polish with a rag and warm, soapy water as soon as you spot it. If the polish is still wet, this may be all that’s necessary to remove it, particularly on semi-gloss or eggshell finish paint.
Moisten a scrubbing pad with rubbing alcohol. Scrub the fingernail polish gently until no more is coming off the wall. Use more alcohol, if necessary. Wipe with a damp rag to remove the alcohol and residue.
Dampen a clean rag with acetone nail polish remover if any of the fingernail polish is still there. Wipe over the spot lightly until the polish disappears. Avoid scrubbing too hard as this may damage the paint.
Clean the area with a rag and warm, soapy water after all the polish is gone. Dry well with a clean rag.