If you turn the brakes, everytime, they get some scoring in there, the drums arn´t gonna last long. I´ve turned a few thousand break drums unnecessarily.
The best way to clean them, is soap (mild dishwashing soap) and water. Spray break cleaner for fluid leakage. A high pressure cleaner works also, but attention has to be paid to the dust boot over the wheel cylinder end, if any water gets behind it, it will cause trouble. A baby bottle brush to get to the hard places (behind the shoes, backing plate, around the axle seal) works well. Put a pan underneath and treat the runoff as semi hazardous waste (don´t throw it in the flowers). Soap and water gets rid of the dirt, sand and salt residue. Grease the adjusters and the shoe contact points.
Sand the shoes with 100 grit (coated) sand paper, lightly and the drums, sanding against the rotation (the narrow direction)( a cross pattern works well, 45 degress one direction/45 degress the other). This will help take off the high spots and promote even wear.
Easy on the brakes for a day or two, to prevent glazing.
The difference in the stopping of the brakes, between new, turned or treated this way, on the brake machine, is unnoticable on the readings. And all that metal you would have cut off, to get to a few low spots, is still there. 0.60 thousandths of wear over new and it´s time to toss them and get a new set.
Same technique works for discs, grease the rails or rods, some kind of vibration damping behind the pads is advisable, spray silicon brake membrane works for me. Copper or teflon inserts also work well, as does copper grease somewhat.
More than you ever wanted to know about washing brakes