It may or may not be effective. Traditional lacquer is a nitrocellulose-based coating. Thinners for nitrocellulose include acetone and ethanol (drinking alcohol). Most nail polishes are nitrocellulose lacquers, and that's why acetone is used as a nail polish remover.
In general, the rule for thinners is that you need to use the thinner that was originally used to make the coating, or which is sold to be a thinner for the coating. If what's on your brushes isn't lacquer, lacquer thinner may not work as well as a thinner designed for the coating, and it may not work at all.
If you already have lacquer thinner somewhere, or some nail polish remover, why not try a little bit to see if it works?
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