Scratched non-stick surfaces and rust are the main reasons flat top grills get ruined. Whether the griddle rusts depends entirely on how frequently it’s used and how well it’s cared for. Performing frequent cleanings and covering the cooktop when not in use are your best defenses against rust. It’s also worth noting that stainless steel flat top grills are much less prone to rusting than their cast iron counterparts. Untreated rust can corrode the burners and surface, leaving behind residue that is not safe for consumption.