Most people learn to live with ich. All those home remedies of garlic, cleaner shrimp, UV etc probably help keep ich in a chronic low level state within a tank. You're happy as long as you don't see the spots - which are only a visible symptom of the parasite infection. However, once the infection gets serious and fish start dropping left and right your only course of action if you want to save any fish is to remove either all the fish or all the live rock/inverts and start hyposalinity and/or copper treatment. These are the only two things that are scientifically proven to KILL ich (crytocaryon irritans).
http://www.reefkeeping.com/issues/2003-08/sp/index.php
http://www.reefkeeping.com/issues/20...ture/index.php