Alcohol is a slow acting solvent on dried up lubricants so soaking in it will not hurt any thing.
A quick flush through the openings, works well for a while then goes back to sluggish/non working state = disassemble-CLA needed.
Tip from American Restoration on the History channel: To remove rust without damaging old parts soak the rusted part in Cider Vinegar for 15 to 30 minutes then wash off. The part will start to rust back in a few hours to a day if not treated with oil, primer, or other rust inhibiting agent.
I have restored a Compur Rapid 00 that had the shutter and aperture blades rusted and stuck to the adjoining blade. Disassembled the shutter, put the rusted parts in a jar and covered with Cider Vinegar and let sit for an hour. Took the blades out, wiped the vinegar off as the rust was floating/settling out in the vinegar, rubbed in extra fine powdered graphite to each cleaned part, reassembled. All speeds from 1 second to 1/100 second within a 20% tolerance, 1/200- 1/2 stop slow, 1/400-1 stop slow.
Compur 0 non working, levers riveted to the main setting ring rusted and non moveable. Soaked in vinegar, wiped off, applied light oil, completed a full CLA, shutter within a 20% tolerance from 1 second to 1/125, 1/250-1/2 stop slow, 1/500- 1 1/2 stops slow.
I have tried white vinegar to remove rust and it does not work.
Compur shutter service manual: http://benoit.suaudeau.perso.neuf.fr...ir-manual.html
Compur Rapid service manual: http://benoit.suaudeau.perso.neuf.fr...air%282%29.pdf