Dave That little heating you did to less than 200 degrees didn't do anything to that brass IMHO. A similar discussion came up recently on Sniper Country and the temperatures finally decided upon as potentially harmful by an egg-head metalurgist manual reading type was much higher than 200(f). But using a liguid chemical type brass cleaner on your brass???? I'd leave it dirty/tarnished before letting the butler clean it. I've never used a liguid cleaner, I'm strickly a corncob media with the magic green stuff covering user. I've used the walnut hull and red stuff but it leaves residue inside the cases that I don't care for and I don't like shooting this same walnut & red stuff out of my barrel. I don't tumble cases too much anymore, I'd rather clean up the necks with some fine steel wool if they're badly sooted up. I do this before I de-prime and clean the primer pocket then length and chamfer. I view reloading as my mental health quiet time. I do things slow and methodical, never is a rush or hurried. Most important of all.... double check everything.