Copper and hyposalinity are the only demonstrated cures. Garlic did not work for me, nor has it been demonstrated to.
Metronidazole is less than 50% effective.
Freshwater dips are ineffective - the parasite survives longer than the fish. And cleaner crabs, wrasse, only eat the visible scabs left by the parasite not the offender itself.
Personally I like to run copper in a very simple QT style tank - see the qt sticky at the top of the page.