>>9471140if you have a ultrasonic cleaner you can throw it into that and it'll remove it after tons of minutes at max power, give it a try it works okay for acrylic.
going by the other reply you made I'm assuming you are using acrylic metallics and I'd advice against it, lacquer is the way to go when it comes to metallic paints.
to be honest I don't actually know how to properly spray metallics myself so I just spray all my metallics underthinned and with pic related