Acetone will not remove the stencil (emulsion). It will remove the plastisol ink, but it is very "hot" and will also damage the screen.

Does acetone dissolve paint?

The solvent strength makes acetone excellent for removing paints and finishes, so it is a common ingredient in paint and varnish removers.

How do you remove emulsion?

Spray on the emulsion remover to a slightly wet screen on both sides, let is soak in for about 15-30 seconds, then scrub with a scrub pad until you can see the emulsion break down and rinse with pressure.