One of the things that I find about letting my properties is that whilst tenants tend to keep most of the property 'reasonably' clean. The one part of the property that gets no attention during the tenancy is the oven.
As far as cleaning goes the oven and grill don't exist. This means when it comes to the check out the oven looks to all intensive purposes like the bottom of a deep fat fryer. I will tell you straight. There is no way I'm going to try and clean it!
My tip is to get it done professionally. I use ovenu. Peter from the Nottingham franchise did mine last week. For £55 he did a fantastic job. Even the ex-tenant could believe how clean it turned out.
Make sure you get it cleaned at the start of the tenancy then:
a) the tenant has a spotless oven which they appreciate.
b) when you have to charge them for the cleaning at the tenancy and take it out of their tenancy deposit there is no argument with the tenant about the validity of the deduction.
Reference my tenants - for less