OOh, please don't use the wire brush! You don't want to remove the coating that's already on there; you just clean off any food that's stuck on. In most cases, a damp paper towel will do the trick.
I wouldn't worry about the oil you use to maintain the seasoning of the pan. Most of the oil is soaking down into the pores of the metal. You'll notice that if you touch the empty pan, you get little to no oil on your fingers; the iron absorbs it, so it's not transferring to your food.