In order to take off the chain, you have to use a special tool to break one of the links. Some folks install a special link called a "master link" which comes apart easily to make chain removal simpler. I don't usually take my chain off for cleaning. I sometimes clean it on the bike using my chain cleaner "thingy". It's a plastic device with brushes inside that attaches to your chain.You put cleaning solution in it and run the chain through it. It works pretty well, but it's kind of a hassle. More often I'll just spray it with Simple Green and scrub it with a stiff brush. I then rinse it off using my garden hose, but not too much water pressure! Just a trickle. Turn cranks a few times to get the water off and let dry before applying lube. Chain cleaning can be messy, so make sure you have newspapers underneath.