We frequently use a stainless steel, perforated grill pan with sloped sides when we're grilling veggies. (We have both a charcoal and a gas grill.) Afterwards, I always spend a long time scrubbing the thing with a steel wool pad trying to get it to look more like new. I wonder whether this time-consuming chore is necessary or even desirable. As long as it's washed clean, does it matter if I scrub off the blackening?