Empty the charcoal and ash out and use a dry rag to pop off any stuck larger pieces of debris. Since the Weber grill has an enamel finish you can simply wash it (inside and out) with a soft rag and some dish soap. Once complete there is no need to oil or season the grill, it is ready for use. To get your grates clean simply add lit charcoal and get the grates to a high temperature for 10-15 minutes and scrub them with a stainless grill brush.