Been doing a bit of oven cleaning lately and have noticed something strange.
A lot of customers have been throwing away their oven or cooker instructions and don’t realise the vast number of functions their ovens have.
For example, the vast number of ovens have a “self cleaning element either at the side, back or top of the oven. This is basically to catch all the oil and grease splashes. There should be a setting on the oven that allows you to heat up the oven to the correct temperature. Once the oven reaches this temperature, the oil and grease should fall to the bottom of the oven, if not, you can brush away any debris that remains.
I’d suggest you contact the oven manufacturer and see if you can get hold of another set of instructions.