Shiny happy people

I have cleaned my oven over the last five years but it's never looked as shiny as this since it was new.

I have discovered a magic ingredient. He's called Keith, and runs a company called Oven Clean. He arrives on time with his bucket and various mysterious potions, gratefully accepts a cup of tea and gets to work. 90 minutes later there's a very clean oven.

He charged £45 which seemed a fair deal to do such a tedious and messy job (and the oven wasn't THAT dirty!). Deep joy all round.