I have a couple of these on SGC and so can be shot 'off range' . They can be great fun to shoot at shorter ranges as long as you don't expect too much accuracy. Just clean out the barrel with a jag and wet patch and then wire brush when the patches start to look a bit cleaner. Remove nipple each time and clean that and the communication. You can put a tube on the nipple and pour boiling water down the barrel but there really isn't the need for that.

Steve.