Just adopted this roo. Poor thing has TERRIBLE scaly legs. Just wanted to post a picture as an example for others. I soaked his legs in epsom salts, applied Campho-Phenique, and then slathered in Vaseline before sending him to bed. Poor guy... :-(
Poor bird! I've seen pictures of worse scaly leg mites before, but this is certainly bad! Along with the vaseline, you can try dipping his legs in olive oil or vegetable oil. Gently scrubbing with a toothbrush can also help loosen any crusty material or old scales.
Castor oil is my choice of treatment. Kind of thick and nasty to apply, but it stays on the legs and softens the bad scales while it is smothering the mites.