How to remove 60 year old brushed Testor's Black and Red enamel?

[bh1701]

I am restoring one of the kits I made in 1964. It was brush painted with Testor's black enamel. The interior was brush painted with Testor's red enamel. I have always found these to be 2 of the most difficult paints to remove. I use Easy Off Oven Cleaner (the one with the really noxious fumes) and have had good results with other colors, but black and red have always seemed to be hard to remove. 

I am wondering if anyone has other good solutions for dealing with these two colors?

I have soaked the parts for 12-24 hours in Oven Cleaner twice, and have done lots of scrubbing with a toothbrush. I haven't gotten it down to shiny white plastic like I usually can. Despite the remnants of the colors, the parts appear to be pretty clean and smooth now, but I am reluctant to apply primer just yet in case the surfaces are rougher than they look.

Here is a picture of what some of the parts look like now.

Thanks,

Bart

[thatz4u]

91% Isopropyl alcohol & cotton balls & elbow grease.....

[atomicholiday]

If you don’t see any paint buildup, I wouldn’t worry about the staining.  Sand it smooth and prime it.

[KWT]

Prime it... sand it smooth especially where needed... prime again... sand IF/Where needed... prime again... then rock and roll

[Bainford]

That's looking pretty clean to me. Just some staining remains. Like the others said, prime it and see where you're at.

[slusher]

Brake.fluid..