Larry Bud wrote:

Lye is the main ingredient in Oven Cleaner. Whether it's in the
concentration you need, I don't know, but I do remember experiments
back in HS where you spray oven cleaner on a bunch of aluminum foil,
and Hydrogen gas is given off as a byproduct as the aluminum
"dissolves".

My brilliant idea, for a hydrogen powered car that you refuel by
swallowing aluminum foil and burping into the fuel tank!