How to Clean and Maintain a Pizza Oven

The core method is the burn-off: running the oven hot so leftover flour, cheese and sauce carbonise into loose ash you can brush away. After a cook, leave the oven on high for 10 to 15 minutes. Stuck-on cheese and sauce blacken and turn to carbon rather than baking on harder.

Let the oven cool completely, then sweep the ash off the cordierite (a heat-shock-resistant ceramic used for pizza stones because it survives rapid temperature swings) with a dry brush or a folded paper towel. That is the whole routine for most sessions. You do not need to clean after every pizza, only when residue builds up.

The stone is the part people damage most, almost always by treating it like a dinner plate. Three rules keep a cordierite stone in good shape.

First, never use soap, detergent or washing-up liquid. The stone is porous, so it soaks up chemicals and then breathes them back into your next base. Second, never put a hot stone under cold water: the thermal shock can crack it straight through. Third, do not scrub off every dark mark. A stone that looks stained is a seasoned stone, not a dirty one, and the discolouration cooks perfectly well.

For stubborn spots, let the oven do the work: run it hot and the residue burns off. If food is physically stuck, wait until the stone is cool and scrape it with a metal bench scraper. For a greasy patch, flip the stone over, since most are usable on both faces, and cook on the clean side while the marked face burns clean on the next fire.

Yes, but how depends on the shell, and a few times a season is plenty rather than after every cook.

Powder-coated steel (the finish on most Ooni Koda and Gozney models) cleans with a damp cloth and a little mild washing-up liquid, then a dry buff. Skip abrasive pads, which scratch the coating and expose the metal beneath to rust. Stainless steel parts such as burners, chimneys and trim take a stainless cleaner wiped along the grain. Bare or painted steel on wood-fired ovens picks up soot; a dry brush and an occasional wipe keep it tidy without stripping the finish.

Gas ovens need one check the wood-fired ones do not: the burner. If the flame turns yellow, burns unevenly, or lifts and roars, the usual cause is a blocked jet or debris in the venturi (the narrow tube that mixes gas with air before it reaches the flame).

With the gas turned off and the bottle disconnected, brush loose crumbs and grease away from the burner ports with a soft brush. Insects sometimes nest inside the venturi over winter and choke the air supply, so running a pipe cleaner through the tube clears it. If the flame is still wrong after that, stop and have the regulator or hose checked rather than forcing it, because gas faults are not a place to improvise.

Rust is the main enemy of a steel oven left outdoors in the UK climate. Moisture is the cause, so the fix is to keep water off bare metal and let any trapped damp escape.

Dry the oven before you cover it. An oven that has just finished cooking is bone dry, which is the ideal moment to fit its cover. Never seal a wet oven under a tight cover, because condensation forms underneath and sits against the steel. If small rust spots do appear, rub them back with fine steel wool, wipe the area clean, and treat bare patches with a high-temperature stove paint where the manufacturer allows it.

A pizza oven survives a British winter comfortably as long as you keep it dry. The real choice is cover versus shed, and both work well.

If the oven stays outside, use a fitted, breathable cover and raise the oven off the ground on its stand or a couple of paving slabs so water cannot wick up from below. If you have the space, moving the oven into a shed or garage is better still. Take the cordierite stone somewhere dry indoors too: a stone that spends winter damp is more likely to crack on its first hot fire in spring.

A cordierite stone lasts for years and does not wear out from staining, so most owners replace one only when it fails physically. Swap it if it cracks all the way through, snaps into pieces, or develops a deep flake that leaves an uneven cooking surface. A hairline surface mark that still sits flat is usually fine to keep using.

Cracks almost always come from thermal shock rather than age: heating the oven too fast from cold, or getting water on a hot stone. Bring the oven up to temperature gradually and keep liquid away from the hot stone, and a replacement is rarely needed.