I need some ideas on how to clean my Turbo 350 transmission case. I have read what I could find on the subject, but need more input. The transmission is original to the car and had never been out until I removed it for restoration. I blocked all the openings and pressure washed all the major grime and road dirt off of it. After 44 years, it was pretty filthy. The case is still very dirty looking and stained. Some say that glass beading will clean it, but will leave the texture on the aluminum wrong. One guy says to blast it with walnut shells. What did you guys with the top show cars do, or have done, to give your transmissions that just off the assembly line look? Any help will be greatly appreciated.