Identify the material before the method. A Q or Family Q body is cast aluminium and caustic degreaser etches it white permanently. Kettles and cooking grates are porcelain enamel, which needs heat and a brush, never a wire wheel. Bare cast iron is seasoned, so a clean that strips it has damaged the BBQ.
Almost every Weber cleaning problem traces back to one thing: people clean the badge instead of the material. A Weber Q, a Weber Kettle and a Weber Genesis share a logo and share very little else, and a product that is genuinely fine on one of them will do permanent, visible damage to another.
This guide is about telling them apart and treating each correctly. If you want the part-by-part method for a home clean, our BBQ cleaning guide for Australian summers and our step-by-step on the Q, Family Q and Kettle both cover that ground. What follows is the layer underneath it, which is the one that decides whether your barbecue survives the clean.
Four machines, one badge
Q, Baby Q and Family Q. The body and lid are cast aluminium. The cooking grates are porcelain-enamelled cast iron. There is a single burner tube, a fat channel moulded into the base and a small catch pan underneath.
Kettle. The bowl and lid are porcelain-enamelled steel. The grate is plated steel or cast iron depending on the model, and there is an ash catcher below rather than a grease tray.
Genesis and Spirit. A cabinet on wheels with painted or stainless steel outer panels, porcelain-enamelled cast iron grates, porcelain-enamelled steel Flavorizer bars angled over the burner tubes, and a proper grease tray running to a disposable catch pan.
Pulse and the electrics are a smaller group again, with an element rather than burner tubes, and they should never be treated as a gas barbecue for cleaning purposes.
If you are not sure which you have, the model and serial are on a plate or sticker on the underside of the body, inside the cabinet door, or on the back panel.
The one that costs money: caustic on cast aluminium
This is the most important paragraph on this page.
Most heavy-duty degreasers and virtually all traditional oven cleaners work because they are caustic, meaning they contain sodium hydroxide or potassium hydroxide. Caustic soda attacks aluminium directly. It is not a matter of leaving it on too long. The reaction begins immediately, it fizzes, and it leaves the surface etched, chalky and permanently whitened. On the inside of a Q lid it looks like a bloom that will not wipe off, because it is not a deposit, it is the metal itself.
There is no repair. You cannot polish it out, because the smooth cast face is gone.
So: nothing caustic ever goes on a Q, Baby Q or Family Q body or lid. Not oven cleaner, not a supermarket heavy-duty degreaser, not a "BBQ cleaner" that does not say what is in it. If the label warns about aluminium anywhere, believe it. If the label does not say, assume the worst.
What does work on cast aluminium is heat, a plastic scraper and hot soapy water. Run the barbecue on high with the lid down for ten to fifteen minutes to carbonise what is on the lid, let it cool until it is warm rather than hot, then flake the loose carbon off with a plastic scraper. The grey flakes that come away are carbonised fat, not paint, and every Weber owner asks.
Porcelain enamel: heat and a brush, never a wire wheel
The cooking grates, the Flavorizer bars and a Kettle's bowl and lid are all porcelain enamel over metal. The enamel is a glass layer, and it is doing a real job: it is the only thing between the food and rusting steel or iron.
So the rule is that the enamel must survive the clean.
- Heat first. Fifteen minutes on high with the lid down turns residue into ash. Brush while the grates are still warm and most of it leaves without pressure.
- Use a brush that cannot outlast the enamel. A nylon or coiled brush, or a wooden scraper. Not a wire wheel on a drill, and not a steel scourer.
- Wire-bristle brushes carry a second risk beyond the enamel: bristles shed, land on the grate and end up in food. Emergency departments see this every summer. If you use one, run a folded paper towel across the grate afterwards and look at what it picks up. A coiled or bristle-free brush avoids the question entirely.
- Chipped enamel is not cosmetic. Once the glass is through, the cast iron beneath rusts, and rust spreads under the surrounding enamel and lifts more of it. A grate with chips through to metal is at the end of its life, and a new grate is far cheaper than a new barbecue.
Coating or seasoning: they are not the same thing
This is where Weber and a lot of Australian barbecues genuinely differ, and it is worth being clear because the two need opposite treatment.
Porcelain-enamelled cast iron is coated. The enamel is the protective layer, it is applied at the factory, and you cannot restore it at home. You look after it by not damaging it.
Bare cast iron is seasoned. The protective layer is polymerised oil built up through use, it is yours to maintain, and a strong degreaser strips it in one go. A stripped plate looks clean and grey and is then more prone to rust than it was before you started. If you have bare cast iron, wash it with hot water and as little detergent as you can manage, dry it on the heat, then wipe a thin film of high smoke-point oil over it while warm and burn that off.
Most Weber grates are the coated kind. Most Australian hooded barbecues from other makers are the seasoned kind. Assuming Weber's rules apply to a neighbour's Beefeater, or the reverse, is how a good plate gets ruined.
Follow the grease path
Flare-ups, smoke that smells wrong and a barbecue that will not get up to temperature are usually the same fault, and it is almost never the grates.
On a Genesis or Spirit, fat drips off the food onto the Flavorizer bars, where some of it vaporises and gives the flavour those bars are named for. The rest runs down the bars, across the slanted bottom tray, out through a hole at one end and into a disposable catch pan. Every one of those stages silts up. The bars carry a hard crust, the tray fills with a sludge of fat and ash, and the drain hole blocks. Once the hole is blocked the tray holds a pool of fat sitting directly over live burners, which is exactly the flare-up people blame on the meat.
On a Q, the same path is a channel moulded into the base leading to a small catch pan clipped underneath. It is easy to forget because it is out of sight, and it overflows into the cart or onto the deck.
On a Kettle, there is no grease tray at all. Fat lands in the ash below the charcoal grate, and the job is emptying the ash catcher regularly, ideally after every second or third cook.
Do the grease path at least twice a season and most Weber complaints disappear on their own.
Burner tubes and ports
Uneven flame, a burner that will not light along its length, or yellow flame instead of blue, usually means blocked ports rather than a failed burner.
With the gas off and disconnected, take the grates and Flavorizer bars out and look along the tube. The ports are the small holes along the side. Clear them with a stiff brush along the tube, and clear individual holes with an opened paper clip or a purpose-made tool, working across the tube rather than along it so debris is pushed out rather than in. Never drill them out, because enlarging a port changes the gas-to-air mix.
Also check for spider webs in the venturi at the control end. It sounds like folklore and it is not: certain spiders are attracted to the smell of mercaptan in the gas odorant, they nest in the tubes, and the resulting blockage produces a flame burning back at the valve. If you see a yellow flame at the control end rather than at the burner, stop and get it looked at.
What actually goes wrong
An etched Q lid. Caustic degreaser, permanent, and by a wide margin the most common serious Weber damage.
Chipped grates from a wire wheel. Fast, satisfying, and it ends the grate's life.
A blocked grease drain feeding flare-ups, blamed on everything except the tray.
A stripped season on bare cast iron, from a degreaser used because it worked on the enamelled parts.
Wire bristles in food. Rare, serious, entirely avoidable.
Should you clean it yourself?
Do it yourself if it is a Q or a Kettle, you burn off and brush after most cooks, and you are willing to empty the catch pan or ash catcher. That routine keeps a Weber in good order almost indefinitely and costs nothing.
Get someone in if it has not been done in a year or more, if the Flavorizer bars and tray on a Genesis have set hard, if the flame is uneven or yellow, or if you are selling the house or ending a lease and it needs to look genuinely restored rather than tidied.
Get someone in immediately if you have already used a caustic product on a Q, before it is used again, so the extent of the etching can be assessed and the rest of the barbecue protected.
Keeping it clean
- 1Burn off on high with the lid down for ten to fifteen minutes after every cook, then brush the grates warm.
- 2Empty the catch pan or ash catcher on a schedule rather than when it overflows.
- 3Do the full grease path twice a season, more if you cook fatty cuts often.
- 4Keep it covered. A Weber cover is cheap and the difference on stainless and painted panels over a few Sydney summers is obvious.
- 5Check the burner ports at the start of each season, before the first big cook rather than during it.
When it is past a brush and a burn-off, book a clean online or check your suburb on our service areas page.