Amongst the many errors in the advice that Shannon Lush gave in her advice on 6PR was her advice not to use Oven Cleaners to clean ovens, but to use a mixture of bicarb soda/vinegar to clean ovens.
In other words what we are expected to believe is that the chemists who have designed products specifically to clean ovens don’t know what they are doing and that she, with no scientific qualifications whatsoever, knows better, and of course the very opposite is the case.
Oven cleaners work by a chemical process called saponification. That is, they literally convert the oil and grease in your oven to a soap.
Here is the reaction
This is why it all wipes up with a sponge so easily afterwards – you’re literally wiping up soap.
Bicarb will not do this as it isn’t alkaline enough, and especially after it has been neutralised by adding vinegar to it.