Gary - If you are trying to restore the 'grain' on your smoker in various spots, you could try a scotchbrite pad or maybe steel wool and water. Pick an inconspicuous spot (in case it doesn't work or makes it worse) and work WITH the grain in a back and forth motion only, applying just enough pressure to make a difference. Use as small a piece of scotchbrite or steel pool as possible, maybe just enough to pinch between thumb and forefinger, just enough to work the area you are interested in. If you are lucky, and as soon as your 'scratches' come close to mimicking the grain, stop. Be satisfied and move on. And then go with what Bobby suggested for protection. Good luck!