Prudie thank you so much, I put a clear top coat on and the nail polish came off mostly! Looked up on the internet hairspray apparently it does not work!
No thank you... I always use nail polish remover but when it runs out and you need something I agree with Prudie : Put more nail varnish (a clear or light one if poss) on the top and then wipe it off straightaway - that will sometimes bring the old stuff with it.. Thanks to everyone for their suggestions! :)