Typically when I need to treat for ich, I'll incrementally raise the temperature to 84ºF over a day or two and administer medication.
I recommend API Super Ick Cure for treating Ich. It effectively treats ich, but be careful as it may stain ornaments and sealant. I've used it and the only thing it has stained is my filter sponge which I don't look at too often so it's not a big deal.
If the potential for stain frightens you, I've heard good things but have never tried Kordon Ick Attack. If you do try this, I'd be curious to hear your results.
On another note, raising the temperature in an aquarium decreases the level of dissolved oxygen in the water so it is good practice it increase oxygenation when raising temperature to not suffocate the fishies.