I believe I have damaged the black nitride finish on my new Baretta Nano. My brother-in-law always has the latest cleaning products, so I rely on him to give me advice. We were cleaning up our guns and he suggested non- chlorinated brake cleaner. I used it to clean my Nano and I am now not happy with the finish. I cannot keep a consistent oiled look. It looks dried out and splotchy in spots. Besides "don't clean your gun with brake cleaner", does anyone have any ideas?