Congrats on your find!
If it's not been used too much I would liightly scrape the sides, top & bottom with a plastic scraper. Then wipe it down with a damp rag/cloth (no cleaners).
Toss in a fatty pork butt & about 4-6 oz of wood. Set er on 225* and let the CS perform it's magic. This should reset any seasoning that may have been lost during the gentle cleaning.
Don't forget to cover the bottom & wood box with foil. Punch a hole in the foil (drain hole).
Welcome to the forum! Make sure to read the Lessons for new users, and read the 101s a time or two.
Plenty of great cooks here to help you along - after you read first, of course!
Have fun & Good Luck!