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Ok heres the situation. I'm stripping models and while the acrylic color is coming off the primer beneath isn't, So I figured that my issue was that it hadn't soaked long enough, so I let it stew in super clean(purple) overnight and while it did kinda come off there were parts that it didn't come off at all. So I repeated the process again. Same result.
Am I doing something wrong or do I need better methods?
This is the result of three baths, scrubbing with an electric and manual toothbrush and letting it soak for 12 hour periods in between.

Primer tends to be really hard to remove.

You may need to repeat soaking and scrubbing a few times to expose more of the primer to the purple stuff.

you could also get a harder plastic brush too (some times that helps) but not everything will come off.

Arrgh white primer,the bane of my life!
What I'd suggest before soaking them again is to go over the models with a scalpel and scrape as much paint off as possible. The other thing you can try is use (gently) a needle file to do the same thing.
Also when they are soaking,use a hard bristle brush(hog hair?) and attack the paint while they are submerged.

Yeah, a thick or heavy primer can be tough - particularly on plastics. There is a type of alcohol most people prefer for use on plastics, but I forgot which one precisely.

Also, do a touch-test. Sometimes you'll have some faded and minor paint in place, but it feels smooth to the touch - if so, you should be fine re-priming them anyway.

Try rubbing them with isopropyl alcohol.

Leave in alcohol/purple power, scrub, rinse, repeat.

It's probably best to leave some of the purple power on and scrub the miniature with a toothbrush so the primer mixes in with the purple power, then rinse it off with purple power (Just make sure you're wearing a dust mask or respirator while doing this and goggles, you don't really want this stuff in your eyes....)

That might help a bit with shifting the primer.

Funny thing is, we've had the same issue before and all we did was go over the old primer with a thin coat of new primer (In the colour we wanted) and found that it didn't really affect how the miniature came out in the end, sometimes you just need to weigh up the options of time and effort.

Purple power tends to work for me.
It helps to rough-up the paint a bit with a hard bristle brush prior to the soak.
Scrape off any excess glue you can see.
I tend to break down the model completely to get at everything.
An old stiff-bristle electric toothbrush is ideal to try to pry the paint off between soaks.
Rinse well, alcohol may be a good thing to use last, it will help with removal of the soap.
If the paint STILL does not come off, give it a gentle sanding to smooth out the excess and re-prime over.

That is what I have done for used models to good effect.

I sometimes have to use combination of metal grill brush and xacto to get the toughest ones out.

Just keep in mind that solvents that specifically targets chemical components of primers also corrode plastic as well. While it won't look like clarence but it does make the plastic quite brittle to shearing forces.