You're an adult and can do as you wish but the news is full of stories about people disfigured or killed using gasoline for anything but it's intended use. Lacquer thinner would be my first choice, acetone my second. Lacquer thinner will remove most paints, acetone will remove those that lacquer thinner won't touch. As you found out mineral spirits are only good on uncured paint.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.