I take them apart and clean with alcohol.
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If we're talking about mag clutches and not spring clutches, I just take them apart and clean them by scuffing them on a green scouring pad, on the two mating surfaces. I've been doing this for years, especially if you don't have the clutches to replace. Used to do it on the Sharp SF-9500/9750 all the time because those machines used to dump developer into the feed assemblies. One good thing, I haven't had to do that much on the KM line lately, because I assume their suppliers offer better clutches (to begin with) so don't have to do much of that any more. On other brands, had to do it a lot. One thing I used to do on the magnetic side of the clutch is to take a screwdriver shaft and put it through the magnet end of the clutch, then knock it against a metal filing cabinet. The idea was to release the residual magnetism inside the clutch body, so as to keep the clutch from sticking when it was NOT activated (magnetized). Again, so glad I don't have to do much of that any more, but we're also losing a lot of the mechanical repair skills we used to have to have to work on these products, which is why I still rebuild some fusers and other components. Besides the cost savings, its keeps your skills sharp.
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