How to remove overspray

[RC944]

got some nasty bleeding from using the pre cut vinyl that came with the shell. i now dont have a neat edge around the window so need to do some tidy up.

ive tried to remove as much as possible with a knife but the edge is not straight and tidy

whats the best remedy? should i mask the edge and continue to strip off the unwanted with knife and acetone or should i try to respray again but just to mask off the windows with liquid mask?