at 1000 quantity I would think it might even make more sense to build a 'array' of fixtures for the chip to go through, so you are not repositioning stuff all the time. You can even make tiny 'blade guards' to protect the chip leads for top and bottom cleaning, most of the way, so you can be a bit less careful doing the 'bulk' of the work.
Keep in mind, those weird solvents might be meant for doing diagnostics work, to analyze IC's and stuff that are suspicious. It might not work well with the plastic and cause the chips to become less reliable. I don't think its designed to 'redo' a botched assembly line. Cleaning chip leads is likely going to be magnified work with scrapers/hooks. The last thing you want to do is deep soaks with chemicals. On the other hand, it might result in less mechanical strain on the IC leads, if you are working with chemically weakened stuff.
*new chip from china is often NOT reliable. Run hot etc. There is a difference between cleaning for sale and cleaning for function. For instance, I could dip a rusty gear box into HCl, and paint it, but its not going to result in a happy customer.
You might want to consider doing a board redesign. Personally, I think if something needed to be potted, for reasons of reliability, reusing chips put through non standard processes is a BAD IDEA. Small traceable repair work.. ok. Mass production with these methods? Ehhhhhhhhhhhhhhhhhhhh
do you feel lucky? In my opinion, E-waste bin needs to be filled up. I don't think people like to hear 'we do it like china' in a sales pitch.