However, it’s crucial to highlight a clean barbecue signals it’s not only food safe, but extends its lifetime. “Take the grill grates out, then take a plastic spatula once it’s cold and scrape out the body,” he advises. Vonhaus 4 + 1 Burner Gas Barbecue, £219.99, Vonhaus“But alternatively, if you want to keep that layer of oil on the grill grates, leave it like that. Top-down cleaningBegin at the top of the grill and work your way down…“When the grill’s cold, start with the grill grates and give those a good clean. Then lift the grill grates out, and go down to the next layer.