Ah, the addiction is deep within this one...good, good...*rubs hands together*...gooooood....
Clean it whenever you want, best way to get to know the inner workings of the rifle, really. Mine just runs so well that I often forget, and will suddenly think, "wait, I just put another couple hundred rounds down range, when was the last time I cleaned this rifle?"
This is usually when I can hear ever so faintly a highly enraged Czech Army Sergeant yelling at me. Fortunately I don't speak Czech so I ignore him...