Isopropyl Alcohol comes in two versions 70% and 90%. Use the 90% version if available. Water or not it works slowly.
Search engine Compur Service Manual, there is one on line and it's been linked to on this site several times.
The shutters in the manual are refinements of the old and the build is similar. I used two different shutters in the manual to service a 1940's shutter, aperture and shutter blades were the same on one shutter and the trimming/ cocking the same on another.
Flushing a shutter is a stop gap measure to use in a pinch and should be followed up with a full disassembly CLA as soon as possible after flushing to get through the photo shoot.