Clean with alcohol as said here. Some of the chips are wire bond which may not fair well under high impact loads. Especially the cheaper ICs (intentional since its less cost that the other high perf package technologies which would be overkill). So for reuse you must also tap and check for any issues/glitches etc. This can also help expose board problems if say a trace is broken.
Me, I wouldn't use them again in a jet. Maybe okay in a small sport plane though.