I’m looking at my aluminum steps right now.
Not sure I’d take it completely apart to free it up.
A good set of Allen wrenches, favorite corrosion spray. PB Blaster, Kroil etc.
Loosen one fastener at a time. Flush crud out move to opposite side and repeat. Working one joint at a time. Then consider getting a joint completely apart and clean real good.
Pics first of how it was.
This is some custom hardware Allen wrench on both ends in some places.
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712