What's easier than oven cleaner? Never fails.
Just remember it's dangerous stuff. Wear long rubber gloves and a mask. You do NOT want to inhale this stuff..!!
Take a strong, leak proof plastic bag, insert a good squirt of oven cleaner, put the model in the bag, and cover the model
in OC. Leave overnight.
(Edit: while the model soaks, keep the bag closed with a rubber band or clothes pin)
Put your gloves back on and take the model out. Rince, while rubbing with a large brush. You'll see the paint just flow
away while the plastic is totally unharmed.
(Here we see the disadvantage of acryllics....When dry, it is a sort of plastic, too. So, what do you use to remove it from
a plastic model? Pure alcohol works best, but veeeery slowly. Endless rubbing with a firm brush, dissolving the paint.)
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Erik.