If you lube your chain regularly, then lube is probably going to get down there anyway. Then you'll be cleaning it out when it becomes gunk, then everything will be clean, then you'll lube your chain, then there'll be gunk, then you clean off the gunk again, then you'll lube the chain again, then it'll get gunky again and then you'll clean off the gunk and then lube the chain again.......
Get the idea?