Ideally, a good recipe (such as ours!) will specify which position the oven rack should be in. That being said, not all do, and even the instructions you do get will probably not account for the ...

which reflects even browning of cakes and cookies baked on two oven racks. Wall oven broiling: This model had Very Good performance for broiling, which reflects temperature measurements with the ...

Confession: I've never cleaned my oven racks. I rely on the self-cleaning mode to take care of the rest of the oven, but that hasn't done a whole lot for the baked-on residue on the racks.