I've only been playing with OA for a couple months and am no expert so these suggestions shouldn't be written in stone. YMMV

De-grease parts before soaking.

Warm water speeds up the process.

1 teaspoon to a small bowl = 4 to 6 hours soak time.

1/4 cup to a 12" x 18" tub 4 inches deep = overnight

1/2 cup to a 18" x 36" container (under bed linen container) = 2 days and may require another 1/4 cup if the action seems to be slow going.

Generally, the larger the container, the less concentration of OA used (for economy purposes), thus the longer soaking times.

Use a white 3M pad to loosen the scale from time to time. I haven't been able to find white 3M's where I live so use a blue scratchless Scotchbrite pad instead.

Rinse off parts and then soak them in a water and baking soda bath(or use a BP paste) to stop the oxidation when finished. Blow dry, then use framesaver or Amsoil Heavy Duty Metal Protector inside frames and bars, and polish outsides to prevent future corrosion.

I'll add more tips to this post as I think of them. Off to work now...