> But oven cleaner isn't about fumes, it's about solvents
> and wiping. In this case, really nasty solvents you don't
> want dripping onto your food months later.

Honey, if you think oven cleaner doesn't have fumes, then you ain't been
using much oven cleaner. The solvents are in the fumes you dolt. True,
they're not as concentrated as spraying it directly on the grease, but if
she can't reach it then she has to use something that has vaporized. Oven
cleaner is (relatively) safe and will be gone within a short time.