Clean the grates thoroughly with a grill brush and warm soapy water if needed
Rinse and dry the grates completely
Preheat the grill to high heat for 15 to 20 minutes
Brush the grates with a thin layer of high-smoke-point oil such as canola, grapeseed, or vegetable oil
Use a paper towel or cloth held with tongs to spread the oil evenly
Close the grill and heat the grates for 30 to 60 minutes
Let the grates cool slightly
Repeat the oiling and heating process 2 to 3 times
Reapply a light coat of oil after each cleaning to maintain the seasoning
Avoid using too much oil to prevent sticking and buildup