"PrecisionmachinisT" fired this volley
in :

Spray on oven cleaner removes it in seconds.

which is also a strongly-basic cleaner (mostly lye).

However, that won't get it out of nooks and crannies you can't reach with
the spray. It's great for open surfaces, though, and won't hurt
steel/iron. Eats hell out of Al, but then, so does TSP.

Lloyd