You indoor coil should only be cleaned by a trained technician. You can clean your outdoor coil provided you have the proper equipment yet it is not recommended by any means.
what you need to do is get a service contract with your local contractor and have them clean the coils. They are trained to do it properly and know what to do and more importantly what not to do.
I fully support the military and the War on Terrorism.
If you don't know, then don't do. If you don't know and still do, then be prepared to pay someone else a lot to undo what you did and then do it right.
If you do know, then do. But do it right. Otherwise, you may not be doing it long.