Skip to content
Grilling & BBQ

How to Clean Grill Grates (and Ditch the Wire Brush)

Wire brush bristles break off and end up in food, sending people to hospital every year. What works instead, and why the material of your grates changes the method.

By The Grow In Backyard Team 5 min read Save to Pinterest — opens Pinterest in a new tab
Close-up of the metal cooking grates on a red grill
Photo: Shixart1985, CC BY 2.0, via Wikimedia Commons
On this page

Start with the part that matters most: stop using a wire brush.

Bristles break off, stick to the grate, transfer to food, and get swallowed. They perforate throats, stomachs and intestines, and they send people to emergency surgery every year. It is a small risk per cook and an entirely avoidable one, because the alternatives work just as well.

The routine clean, every cook

  1. After cooking, close the lid and run it on high for 10 to 15 minutes. Residue carbonises to loose ash. On charcoal, do it while the coals are still hot.
  2. Scrape with a bristle-free tool.
  3. Wipe with oil — fold a paper towel, grip it with long tongs, dip in cooking oil, wipe the hot grates. This lifts what remains and leaves a protective film.

Two minutes. Done every time, the deep clean becomes a formality rather than an afternoon.

Tools that are not wire brushes

Bristle-free options
ToolHow it worksNotes
Coil / spring brushTight steel coil scrubs, nothing to shedThe direct replacement; excellent
Flat metal scraperScrapes along the barsCheap, durable, very effective
Wooden grate scraperBurns its own grooves to fit your gratesSafe on porcelain; wears down over time
Ball of aluminium foilCrumpled foil held in tongsFree, works well, disposable
Half an onionSteam and sulphur compounds lift residueGenuine technique; light cleaning only
Grill stone / pumice blockAbrades residue awayEffective; crumbles as it works
Nylon brushFor cold, soapy deep cleaningMelts on hot grates

Why the wire brush is worth taking seriously

This is not a theoretical hazard. Wire bristles are thin, sharp, and effectively invisible against a grate or in food. Swallowed, they lodge in the throat or perforate the gut wall, and removal usually means endoscopy or surgery. Health authorities in several countries have issued warnings. If you keep using one, inspect the grate carefully after every brushing and replace the brush the moment bristles start coming loose — but the simpler answer is a coil brush or a scraper.

Match the method to the grate

By grate material
MaterialClean withNeverAftercare
Stainless steelHeat, scraper, soap and soakSteel wool (leaves particles that rust)Dry
Porcelain-enamel coatedHeat, nylon or wooden scraper, soapy waterWire brush, abrasive pads, metal scrapersDry
Bare cast ironHeat, scraper, stiff brushSoap, soaking, dishwasherDry, then oil immediately
Porcelain-coated cast ironAs porcelainAnything abrasiveDry
Chrome-platedGentle scraping, soapy waterAnything abrasiveDry; replace when plating fails

Porcelain enamel chips, and once it does, the cast iron underneath rusts and the chip spreads. Every abrasive tool used on it shortens its life.

Bare cast iron behaves like a skillet. Soap strips the seasoning, water left on it rusts it within a day. Clean it with heat and a scraper, then dry and oil while warm — the same polymerised-oil seasoning described for griddles.

The deep clean, a few times a season

  1. Remove cold grates and soak in hot water with dish soap for an hour — stainless and porcelain only.
  2. Scrub with a nylon brush or a non-scratch pad.
  3. For heavy build-up, a paste of baking soda and water, left 20 minutes, lifts most of it.
  4. Scrape the inside of the lid. The black flakes are carbonised grease, not paint, and they fall onto food.
  5. Clean the firebox and, on a gas grill, the flavouriser bars or heat tents.
  6. Check the burner ports on a gas grill and clear blocked ones with a paperclip. Uneven flames usually mean blocked ports.
  7. Empty the grease tray.

Grease is what causes grill fires

Fat accumulating in the tray, the firebox and the drip channel is the fuel for the flare-up that becomes a fire. Emptying it takes a minute and is the single most useful safety habit here. Never use water on a grease fire — close the lid, shut off the gas, and smother it.

Rust

Surface rust on stainless or cast iron: scrub with a nylon or brass brush and baking soda paste, or a scouring pad on stainless. On cast iron, take it back to bare metal, then re-season with thin layers of oil and heat until it darkens.

Rust under chipped porcelain: cannot really be fixed. It spreads under the remaining coating.

Heavily pitted grates: replace them. Rust returns from inside the pits however well you clean, and replacement grates are cheap next to a new grill.

What to skip

  • Oven cleaner. Caustic, strips seasoning and coatings, and leaves residue you then cook on.
  • Pressure washers. They force water into burners and controls.
  • The dishwasher. Fine for some stainless grates, ruinous for cast iron.
  • Cleaning cold and dry. Everything comes off far more easily hot.
  • Leaving it until spring. Grease sets hard over winter and the job multiplies.

Step by step

Time
PT20M
Cost
$0
You need
Cooking oil, Paper towel or a cloth, Aluminium foil, or half an onion
Tools
Bristle-free grill brush, scraper, or a wooden scraper, Long tongs, Bucket and dish soap, for a deep clean

  1. Burn the grates off while the grill is hot

    Close the lid and run the grill on high for 10 to 15 minutes after cooking. This carbonises residue into loose ash, which is far easier to remove than baked-on grease. On charcoal, do it while the coals are still going.

  2. Scrape rather than brush

    Use a bristle-free tool — a coil-style brush, a flat metal scraper, a wooden grate scraper, or a ball of foil held in tongs. Wire brushes shed bristles that stick to grates and end up in food, causing serious internal injuries every year.

  3. Wipe the hot grates with oil

    Fold a paper towel, hold it with long tongs, dip it in cooking oil, and wipe the hot grates. This lifts remaining residue and leaves a thin protective film. On cast iron this doubles as re-seasoning.

  4. Deep clean a few times a season

    Remove the cold grates and soak them in hot water with dish soap for an hour, then scrub with a nylon brush or a scouring pad. For heavy build-up, a paste of baking soda and water left for 20 minutes lifts most of it without harsh chemicals.

  5. Match the method to the grate material

    Stainless and porcelain-coated grates tolerate soaking and soap. Bare cast iron does not — soap strips the seasoning and soaking causes rust. Never use a wire brush or abrasive pad on porcelain enamel, which chips and then rusts underneath.

  6. Dry and re-oil cast iron immediately

    Dry bare cast iron grates thoroughly, then heat them and wipe on a very thin layer of oil. Cast iron left damp rusts within a day. Porcelain and stainless grates need drying but no oil.

  7. Empty the grease trap and clean underneath

    Scrape the inside of the lid and the firebox, and empty the grease tray at least a few times a season. Accumulated grease is the main cause of grill fires, and flaking carbon from the lid falls onto food.

Common questions

Are wire grill brushes dangerous?

Yes, and it is a documented problem. Bristles break off, stick to the grate, transfer to food, and are swallowed — causing perforations of the throat, stomach and intestine that require surgery. Emergency departments treat these injuries every year. Bristle-free coil brushes, flat scrapers, wooden scrapers and foil balls all work as well and carry no such risk.

What is the easiest way to clean grill grates?

Burn them off. Close the lid and run the grill on high for 10 to 15 minutes after cooking, which turns residue to loose ash, then scrape it away with a bristle-free tool and wipe with an oiled paper towel. Done every time you cook, this takes two minutes and prevents the build-up that requires real work later.

Can you use soap on grill grates?

On stainless steel and porcelain-coated grates, yes — soak them and use dish soap for a deep clean. On bare cast iron, no: soap strips the seasoning that makes the surface non-stick and protects it from rust. Clean cast iron with heat, a scraper and oil instead.

How do you clean rusty grill grates?

Scrub the rust off with a nylon or brass brush and a baking soda paste, or with a scouring pad for stainless. On cast iron, remove all rust down to bare metal, then re-season by heating the grate and wiping on thin layers of oil until it darkens. Heavily pitted grates are better replaced, since rust will keep returning from the pits.

Does an onion actually clean a grill?

Reasonably well, and it is a legitimate technique. Halve an onion, spear it on a fork or hold it with tongs, and rub the cut face over hot grates — the moisture steams residue loose and the sulphur compounds help lift it. It will not shift heavy carbon, but for a light clean it works and there is nothing to break off in the food.

How often should you deep clean a grill?

Quick-clean the grates every cook, and deep clean the whole grill two or three times a season, or more with heavy use. The deep clean matters most for the parts you cannot see: the grease tray, the firebox and the underside of the lid, where accumulated grease is the main cause of grill fires.

Backyard Weekly

Know what to plant, week by week

Free planting calendar. Join the weekly email for seasonal jobs, fixes for what is going wrong, and gear worth buying.

Set MONETIZATION.email.endpoint in src/config/site.ts to enable this form.

By subscribing you agree to our privacy policy. Grow In Backyard will never sell your address.

Keep reading