Use method #17 to get Nitric acid. Then use gentle method to get IC to the right temperature and use ultrasound bath to clean residue. 

Since the beginning of the project I've never measured the temperature of IC but of the heating head, which is correlated but definitely not equal. Now I've made some simple Arduino based IR temperature sensor plus mosfet to control heating head temperature.

This way I can set 80°c and be sure that no acid is wasted and IC is not above it's maximal temperature.