I'v tried different cleaning solutions ,, this is old grungy brass ,,only fair cleaning ,,found a gallon of "OLD "ammonia ,so old it didn't hardly have a smell ,,poured it straight in my ( small ) sonic cleaner ,, 2= 10min, cycles ,, rinsed ( clean-clean - clean Sgt. Carter ) cleaned it inside & out ,, now I can see the splits - cracks etc.
smoke'm if y'a goy'm ,, Hootmix .