How to clean an oven (the non-toxic way)

Knowing how to clean an oven properly is the difference between a genuinely spotless cavity and a wipe-over that just moves the grease around. Most supermarket oven cleaners rely on caustic soda to dissolve baked-on fat, which works — but leaves behind fumes strong enough to clear a kitchen, and a residue you don't want anywhere near your next roast. The good news is you don't need caustic chemicals to get real results. This guide walks through a non-toxic method using bicarbonate of soda, white vinegar and a bit of elbow grease, the same basic approach professional non-caustic cleans are built on, just scaled for a weekend at home.

It won't be instant — budget 30 minutes of prep, a few hours (or overnight) for the paste to work, and another 20–30 minutes to wipe down and rinse. But at the end of it your oven is genuinely safe to cook in straight away, with no chemical smell lingering in your food.

What you'll need

• Bicarbonate of soda (baking soda) — about half a cup
• White vinegar in a spray bottle
• Warm water
• A soft cloth or non-scratch sponge
• An old toothbrush or grout brush for corners and seals
• Rubber gloves
• A plastic scraper (not metal — it can scratch the enamel)

Step 1: Clear the oven and remove the racks

Take everything out — racks, trays, and any loose crumbs or debris in the base. Racks get cleaned separately (see our guide to cleaning oven racks) so they can soak while you work on the cavity itself.

Step 2: Make the bicarb paste

Mix bicarbonate of soda with a small amount of water until you've got a spreadable paste — roughly the consistency of a thick milkshake. This is your main degreasing agent; bicarb is mildly abrasive and alkaline enough to break down grease without being caustic.

Step 3: Coat every interior surface

Using gloves, spread the paste across the base, sides, roof and inside of the door, avoiding the heating elements themselves and any exposed wiring. Really work it into the worst baked-on patches — a thicker layer sits longer and lifts more.

Step 4: Let it sit

This is the step people rush, and it's the one that matters most. Leave the paste for a minimum of 4 hours; overnight is better for an oven that hasn't been cleaned in a while. The longer it sits, the more the grease softens, and the less scrubbing you'll need to do afterwards.

Step 5: Spray with vinegar and wipe

Spray the dried paste generously with white vinegar — it will fizz as it reacts with the bicarb, which helps lift the loosened grease off the surface. Wipe it away with a damp cloth, rinsing and re-wetting as you go. For stubborn patches, use the plastic scraper at a shallow angle, then go over the same spot with the toothbrush for seals and corners.

Step 6: Rinse and dry

Give the whole cavity a final wipe with clean water to remove any bicarb residue, then dry with a fresh cloth. Refit the racks once they're cleaned and dry, and your oven is ready to use — no airing-out period, no lingering smell.

When it's worth calling a professional

This method works well for regular maintenance and moderate buildup, but there's a point where DIY stops making sense. If your oven hasn't been properly cleaned in over a year, has thick carbon deposits that don't respond to a first pass, or you'd simply rather not spend a Saturday scrubbing a cavity in an awkward crouched position, a professional non-caustic clean gets the same fume-free result in under two hours — including the racks, door glass and seals — with the work guaranteed. If you're in Brisbane, our oven cleaning uses commercial-grade versions of the same non-toxic gels described above, applied and stripped back by hand.