Mostly, I clean mine by brushing sawdust onto the floor.
Comes that way from the factory.
Not unless it somehow gets rust on it.
Johnson's Paste Wax.
Washing soda (sodium carbonate, Na2CO3). Dissolve about 1/4 cup (60ml +/-) in a quart (liter) of warm water in a shallow pan. Lay the blade in the water. Watch the gunk float off of the blade. Allow to soak for five minutes. Scrub lightly with a nylon or brass brush, if needed to remove stubborn gunk. Rinse with warm water, and dry with a towel.
Cheap. Fast. Easy. Safe. Environmentally benign.