Oven cleaning: caustic vs eco vs DIY, what each actually removes

We were tired of arguing about oven cleaner. Three of our cleaners swore by caustic, three swore by eco gel, and one insisted on the bicarbonate-and-vinegar trick. So we bought three identical second-hand ovens, baked the same lasagne in each one six times, and cleaned them with each method. We weighed the residue before and after, and photographed the door glass under raking light.

The setup

• Three identical Bosch single ovens, 5 years old, equally clean at the start.
• Six identical lasagnes baked at 200°C for 45 minutes in each, with no rack tray.
• Starting residue weight (carbonised grease and burnt cheese, scraped to a digital scale): 41g, 39g, 42g.
• Three cleaning methods, one dwell time, one cleaner per oven.

Method 1: Caustic oven cleaner (Mr Muscle 5-Minute)

Sprayed on cold oven, left for 90 minutes (5 minutes is marketing, not chemistry), wiped with a green scourer and rinsed twice.

Glass: perfectly clear under raking light. Time: 22 active minutes after the 90-minute dwell. Smell: strong, lingered 6 hours. PPE used: nitrile gloves, safety glasses, open window.

Method 2: Plant-based oven gel (Astonish Specialist)

Applied with a brush, left for 90 minutes, scrubbed with a non-scratch pad, rinsed.

Glass: a visible film at raking light, removed only by a second application and an additional 60 minutes of dwell time. Total time: 48 active minutes. Smell: mild, gone in an hour.

Method 3: Bicarbonate paste and white vinegar

Bicarbonate of soda mixed to a paste with water, applied thickly, left overnight (10 hours), spritzed with white vinegar, scrubbed and rinsed.

Glass: significantly improved but still cloudy at raking light. Time: 35 active minutes plus a 10-hour wait. Smell: vinegar, gone in 30 minutes. Cost per clean: under 30p.

What we changed in the van

Safety, in plain terms

• Caustic burns skin in 30 seconds. Always wear nitrile gloves and safety glasses. Open the window.
• Never mix caustic oven cleaner with anything containing bleach. The combination produces chlorine gas.
• If using overnight bicarbonate paste, dispose of it in the bin, not the sink. The paste blocks drains as it dries.
• If you have a young child or a pet in the house, do the caustic clean while they are out and ventilate for two hours after.

What to watch in 2026

Two enzyme-based oven cleaners are due to launch in the UK trade catalogues in autumn 2026. Early lab data from the Dutch manufacturer suggests cleaning performance within 8 percent of caustic, with no skin-burn risk. If the real-world testing matches the lab, our caustic stock will halve by 2027.