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I just did the same thing, with a set of OHV race springs and a HF rock tumbler (stole it from my wife). The springs were dry, w/o any oil or grease, just rust.
I used silica sand, dry. It only took about 12 hours.
I've also found a great de-greaser. $25 for 5 gallons. It's what restaurants use. I use it like the old carb cleaner, with a basket from one of those.
It's recommend to be cut, at least 10/1, with water but, so far, I've used it straight. It doesn't clean as well as carb cleaner but, it does take all the oil and grease off.
I haven't used it with a pressure washer, just rinse in hot water and blow dry.