Never EVER cook fish uncovered in your microwave. The lemon didn't work, the vanilla didn't work and now the bicarb is sitting in there in a dish, not working. I have thought of leaving the door open for a few days, but I'd rather not as the microwave sits on top of the fridge freezer and I'll keep banging my head on the open door. Also, then the whole kitchen will smell of fish : I might have to try that next though.

Not sure about vinegar, I know it's fab for removing limescale but I hate the smell do I dion't want to end up with a vinegar smelling microwave either!