I have used Pine Sol to remove stages of factory lettering and some paint from rolling stock, BUT what is a good paint removed for Testors spray and Krylon, etc rattle can spray paint. I am afraid I will melt the body if I use something too strong.
I have had good success using Walmart's brand of Oven Cleaner - has not damaged any plastic so far.
Can't speak for how it will do on the Krylon (haven;t tried it)
My go to paint stripper is denatured alcohol. It doesn't work fast but it works well. I usually let victim..... er., subject soak submerged for 24 hours then check it. Do not use acetone on a plastic model! Don't ask how I know this.
I tried the Wal Mart oven cleaner this weekend, it works very well, I looked at the results after almost two hours, and most of the bad paint job washed away with water and a tooth brush. Gives me confidence. Thanks everyone.