it will be difficult to measure doses, so i cant recommend actually salvaging the powder, but nail polish remover is mostly acetone and should evaporate. I imagine some residual carcinogenic bullshit would remain, but i bet its not more harmful than sitting in a traffic jam breathing diesel exhaust, or spraying your face and head with fucking hair spray. Danger is kind of relative with all of the chemicals in our world. And if youre dependent, i imagine a little acetone residue is the safer choice over withdrawing and having a gran mal seizure... lots of factors here.