We have used everything here and the plastic media/alum oxide is the best we feel. The soda was good and also cheaper to have done, but the prep to clean/neutralize the soda ran the end cost up and along with not being able to do rust anyway just made us decide that media is the way to go. Forget chemical dipping also, we have had a feww cars come in that were dipped to start with and theres another can of worms with that.
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