The "best" way to strip paint from metal models is to use an industrial 200W ultrasonic cleaner. I just stripped a Key GS-3 for superdetailing and repainting using an ammoniated cleaning solution. Took four baths of 45 minutes each to get all the paint off, but it's down to lovely bare brass now.
If you really want a 600 dollar industrial ultrasonic cleaner, look for used dental supplies. I picked mine up (a refurbished unit) a few years ago for around 200 bucks...and it is well worth it for those of you who like to work with metal models.
Cheers!
Bob Gilmore