Every day: It’s hard to imagine having the discipline to wipe out the oven after every use, but deep down you know it makes sense – just think about never having to do a huge oven blitz again.

Cleaning a dirty oven requires natural materials and elbow grease.

The non-caustic method calls for, you guessed it, bicarbonate of soda, mixed to a thick paste and smeared all over the inside of the oven. Leave overnight then brace yourself for some serious scrubbing with water and a scourer.