The first rule of oven cleaning club...you do not talk about oven cleaning!
Its not that, okay you could go and buy two packs of oven pride (one is never enough), a scraper, some blades, some scourers, a lot of cloths, glass cleaner...the list goes on to get a modest result, and half a day of your life .......or just pay someone who does it day in day out and sit and have a brew while its being done.