[2000mc]

If it makes noise when parked, heard when you press and/or release the brake pedal, and you just cleaned everything well with brake clean, and you're reasonably confident the hardware is where it should be.... My thought would be that you actually cleaned things too well. Take the drum off, lift the shoes off the backing plate with a larger screw driver, then with a pocket screw driver I sneak a dab of anti-seize onto the contact points

....might as well wait till you're replacing the wheel cylinders though