I think Dennis meant Harbor Freight instead of "Horrid Freight."
I have used baking soda in the summer in Virginia with good results. I was using it outside. I liked it as it was cheap and easy to control. It will not touch brass but I used vinegar to etch this.
Regarding using media blasting instead of paint stripper, I am not a chemist but somehow I just think putting such a powerful chemical, whatever it is, on styrene cannot be good for the styrene in the long run. And let me tell, you do not want to use Chameleon paint stripper with resin. You do not want to know how I know this.
Bill Welch