When shooting the old corrosive ammo I always clean very well right after. I had a nice rifle die because I failed to do that once, so never again. (granted it took a looong period of neglect but still)
As far as my older AK's were concerned (ones I owned many, many moons ago) I hardly ever cleaned them, but never shot corrosive ammo, as I could afford the good stuff then. After all, if you have to clean an AK every day, why have an AK at all?