[namibj]

You should be able to use acetone. See the solubility table [0] for PLA. It takes longer, but it works.

[0]: https://onlinelibrary.wiley.com/doi/pdf/10.1002/app.38833

[dezork]

Acetone really don't work well for PLA. You need tetrahydrofuran to smooth PLA in the same way that acetone smooths ABS.