Just experience. 100% of the models I buy are from eBay. And 100% of the plastic goes in the bin or if it's somewhat salvageable may get quickly tarted up and resold.
Why? Because no matter the glue used it's everywhere I don't need it. If it's poly it's melted the plastic, if it's superglue then it's rock hard and a real nightmare to try and remove.
I've yet to find anything that will totally break down CA and not melt plastic although Knight Girl here says she did.
And now I'm at the point of having about 50 mint 5th edition mounts so I don't need to mess about trying to strip plastic.
One exception.... A job lot I bought once. Bretonnian of course.... Horrendous paint but lots of metal. I thought I'd have to bin it all as usual. No, no, no.... This kid had used UHU glue, dried up tube included lol, I could literally peel it off with my fingers and the horsies all scrubbed up like new