"RST Engineering" writes:

but the stuff of choice is plain old
Arm&Hammer baking soda at about a 10% concentration in water. When it stops
bubbling with each fresh application, you is done.


Nod... On cars, I leave some baking soda in place, for future leaks.

The only good news is aircraft are largely aluminum and at least the
mild acid in batteries has little effect on same. Alkali, however....

(Soaking in a tank of 180+F lye is often used to degrease/depaint/derust
{steel} engine blocks. Just be VERY sure that the aluminum pistons etc.
are not attached...or you'll see why...)

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