I'd go with "never" on the fuel filter... unless the car is having problems.
I'd treat the hydraulic clutch system the same as the hydraulic brake system. Some say they should be flushed every couple years. That said, I've never really flushed em at all. Well, I did my motorcycle once because the fluid looked so dark. And if I have the brakes apart for other maintenance maybe I'll do a flush then, depending on how the fluid looks. Can't say that my lax schedule has caused me problems.
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