So, sourdough is in the banneton, time to preheat the dutch oven to bake it, and you find you have spilt something in the oven and it needs a blitz clean before you preheat it to megahot and turn the spill into a glass-like substance that is then part of the structure of the oven, forever and ever, amen.
Furthermore, you find the nozzle on your oven cleaner, which has been a bit iffy the last couple of times you cleaned the oven; has been a bit dodgy in the spraying department, is now utterly clogged. And you can’t free it up with a pokey pin…
And the can still has about a quarter of the contents still inside it.
Pry off the nozzle, soak it in vinegar for a couple of minutes, rinse under the tap, poke it back on top of the can, gladden your miserly heart by using the rest of the can’s contents.
Boom! EASY-OFF for the win!

Well done Bwucie.
The budget control officer is very adept at cleaning ovens, and i make a point of never interfering!.
Cheers,
Jacko