Steel wool, even a very fine grade, is not something I would recommend using on rosewood bars ever, especially vintage rosewood. I would suggest calling or emailing Gilberto Serna at Century Mallet Co. in Chicago. He worked at the Deagan factory as a master tuner when they were still in operation. He now owns Century Mallet, located in the old Deagan building, and does beautiful restoration work on vintage mallet instruments.
Bill Youhass at Fall Creek Marimbas, Artie Lieberman at Mallet Instrument Service, or John Salazar at Salazar Fine Tuning also repair and restore vintage mallet instruments, and will be able to prove you with the information you need.
Sounds like a nice instrument!
Talk to Gilberto, he's very nice, I called him and he had parts for my Deagan Commander Vibraharp and he also has all the knowledge you need to keep yourself from screwing the sukkas up.