How to Clean Your Fire Pit Like a Pro – FirePit.co.uk
Leave the fire pit to cool. Remove any ash or debris; use a small shovel. Use hot soapy water and a soft cloth to wipe clean. Rinse with a hose and allow the air to dry or wipe dry. With corten steel fire pits, a rust layer will develop over time after exposure to weather. This protects the inside layer of steel; try not to remove this rust layer.