OK, guys, here is a question. Mazda 626 with manual transmission has
the clutch pedal that does not always come back (seems to just stay
stuck).

A bit of background. The winter before the last one the clutch pedal
would get very difficult to press, while it was the freezing
temperature outside. After the car warmed up, the clutch became normal.
The winter before that one there was no higher resistence, things
worked the same regardless of the temperature. Last summer at some
point the clutch stopped operating, it turned out that all that the
fluid had leaked out. Once I added the fluid, things normalized after
few tens of pedal presses. Then, the past winter the clutch would be
first normal (while the car is cold), and then once it warmed up the
resistance to the initial pedal movement would decrease. Eventually,
the pedal started to get stuck more and more, and it depended on either
that was the early presses, or the later ones once the car was started.
There is also some fluid visible on the left of the clutch pedal inside
the car, kind of on the carpet near the vertical wall that is the
continuation of the driver's door toward the engine compartment.

Is this sufficient info to say what needs to be replaced?

Thanks!
Mike