Everytime I clean my oven its the same frustration nothing works!!! I have tried almost everything under the sun bar the Shelley's 30 min one because if I do it'll take off the paint.  Tried what feels like a million different cleaners (ok not that many on the market but you get what I mean) over the years including the vinegar and ammonia method. Every spray known to man and then today oven power with zero success.  Someone shoot me please!!! Cleaned it twice already and does nothing. GRRRR I wish I could just buy a new one every 6 months 🙂 Now there's an idea! lol  Ok vent over!