You might search the forums. There was a discussion of using a weak Oxalic acid solution or rust removal gel to clean down to bare metal without marring the paint.
There's also this list of
rust removal products.
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"I had a great ride this morning, except for that part about winding up at work."
Bikes so far: 2011 Felt Z85,
80's Raleigh Sovereign (USA),
91 Bianchi Peregrine,
91 Austro-Daimler Pathfinder,
90's Trek 730 Multitrack, STOLEN:
80 Schwinn Voyageur (Japan)
