I would definitely not recommend acetone for stripping paint from styrene.
(Other plastic types like ABS -may- be OK, but I'm not sure). Even brief exposure to acetone will cause the surface of styrene plastic to become soft and sticky, and if left in the acetone long enough it will become a sticky, gooey mess.
(I know from bitter experience

)
I've done a lot of paint-stripping on plastic models over the last year or so as I bought a large number of second-hand
1/35 military vehicles on eBay. Most were badly and heavily painted and needed to be stripped before repainting.
Phoenix Paints (they have a stand at many model and model engineering shows) make a product called "Superstrip" (I think) which works amazingly - removes any paint quickly and cleanly, with no affect on the base plastic. However, the snag is that it is -horrendously- expensive, around £5 for a small bottle.
Also available at most model shops is a product called Modelstrip. This is a paste which you have to paint onto the model,
seal it in a plastic bag and leave overnight. I haven't tried this one myself.
Some other "plastic-friendly" paint strippers:
Acetone-free nail varnish remover - can work well if used with care. It does soften styrene if left in too long
(more than a couple of minutes). Works on both acrylic and enamel.
Car brake fluid - works very slowly (soak for several days), not sure how well it works on enamel.
Bleach or caustic soda - works very well on acrylic, but has little effect on enamel - avoid getting any either on your
clothes or in your eyes at all costs! Also tends to bleach the colour out of the plastic.
Dettol disinfectant - works brilliantly on acrylic, not sure about enamel; however, the items stripped tend to smell
strongly of disinfectant unless washed very thoroughly.