Recently picked up a Wapak chickenfoot on ebay. I knew it needed some work the the carbon build up is a lot more then I thought. I usually clean my skillets with an oven cleaner and let it sit for a day. I never used it on a skillet this bad. Most of the build up is in the outside side wall. Would letting the oven cleaner sit for longer and multiple applications take care of the build up or would I need a lye bath? I would prefer the oven cleaner.