Try Jesse Brennan’s recommended solvents first.
Paint remover won't do the aluminum any good so don't
leave it in the machine for a long period.
Remove the saw blade to clean it. If those (Jesse’s) solvents
do not work try “Easy Off” oven cleaner or boil the saw blade in
washing soda (calcium carbonate).
Soy oil is a fat and when treated with a caustic alkali, which
is what oven cleaner (strong) and washing soda (weak) are, the
alkali reacts with the soy fat to form a soap which can be
rinsed off with water.
The ancient Romans boiled animal fats with wood ash* to make
soap. When you rub “Easy Off” with your fingers the fingers
feel soapy because the fat in you skin is being turned into
soap. (* After a forest fire the streams and lakes suffer from a
rise in pH -more alkalinity- on account of the wood ash going
into solution and this kills a lot of aquatic life).
Alkalis react with aluminium so brush off the gunk as soon as
practicable and rinse. Wear gloves.
After the gunk is gone try drilling out the bolt.
There is a screw extraction tool called “easy out” that hardware
store should stock. It is a reverse threaded screw that bites
into a hole drilled into the broken bolt.
Drill a hole into the broken bolt that leaves enough metal so
that the "easy out wouldn’t strip it. When you turn the “easy
out” anti-clockwise its threads will bite deeper into that hole
to provide a firmer grip. But anti-clockwise is the direction
to unscrew the broken bolt which is the whole idea.
Kelvin Mok (firstname.lastname@example.org)
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