Kick ich is pure snake oil. Won't work. If it clears up it's pure coincidence. The best thing to do is to soak the food in garlic and hope. Ich will always be around in your tank now, you just have to hope your fish are strong enough to fight it off.
There is no way to get Ich out of your main tank unless you run fishless for at least a month and QT al your fish in hyposalinity. Given that most people won't do that (really you should QT all your fish first and avoid getting it in your main tank but I digress) best thing is to feed garlic and hope. Many people have Ich for years that occasionally shows up on a fish then goes away. It's never gone just not on your fish at that moment.