Please don’t take this as anything other than guidance or helpful information.
If you use a caustic product to clean your oven but don’t strip the ovens down first the the product used will get into places that you can’t see or get to.
When it comes to cleaning the product out some will be left behind, it will cause corrosion and it never stops, heat in fact makes it even more aggressive, it warps elements, reduces screws to dust whilst enlarging the fixing holes and severely pits the ovens enamel, plus much more.
Remember if you don’t do the job properly and you ruin your oven there is nothing we can do at that point.