Fill a pot with water and bring to boil. Once water is boiling, soak corn in the pot for 30 minutes.
While the corn is soaking, fire up your grill to 350 ˚F.
Remove corn from the pot and peel back the husks without detaching.
Place corn on the grill and cook for 15 minutes, turning occasionally.
Remove corn from the grill.
Slather corn with mayonnaise and add cotija and chile powder.
Drizzle corn with lime and sprinkle with cilantro.