How often should one clean the oven?

No.

You should sack your housekeeper immediately.

Tell the dirty b!tch to shower every day.

Personall I will just replace mine after 2 years. I am never cleaning one again.

i already have sacked her. in 1998. i think thats the problem.

mr muscle oven cleaner is a load of bs, ive put it in the oven and its just sat there doing bugger all. im gonna try it with the top off next.

womansa job to clean the oven as they are better at cleaning than men.

I don't see how getting semi naked will help this situation.

Why bother, the temperature reached will kill any bacteria so its pointless.

Not for 24hr pork at 50C it won't.

24 hour pork? That's some powerful viagra.