GET IT CLEAN: Clean grill pan just like cast iron cookware. If you don't have a grill brush, make a quick, disposable scrubber by balling up a sheet of aluminum foil. Use the ball to scrape the pan’s ribbed grate. Use coarse salt and water to attack caked-on grit. After the surface is clean, wipe down the pan with paper towels. Heat the pan over medium until it’s very dry. Finally, rub down the surface with an oil-covered paper towel and heat for another 5 minutes, then let cool.