If we are camping we do this on a cooking rack over a campfire, but can also be done on a gas grill or on a charcoal grill. This is what I do at home.
Sometimes I will pull back the husk on each cob about half way or so, and get out as much of the corn silk as I can, and close the husk back up. Most of the time, I just leave the corn husk alone, and just take a stout pair or scissors and cut off the top of the cob with all the hair, and then cut off the bottom, making sure not to get to close to the actual corn inside.
Run you some cold water in the sink or bin, just enough to cover the corn. It will float, I just usually spin it here and there when I think about it. Sprinkle some kosher salt on top and mix it all around (optional). Maybe a handful or so (cup to cup and 1/2)
I generally soak the corn for about an hour and then place on the cooking grate, grill, or whatever your cooking with. Turn them every 5-10 minutes so the husk dont catch on fire and you cook them evenly. How long really depends on how hot of a fire you have. It will take between 30 minutes to an hour depending. You want the husk to get a nice char, dont worry, the inside is not burning, only the outside. You can give the corn a slight squeeze when you wonder if its ready, it will be softer.
Shuck, butter, eat :icon_smile_bbq: