Hi, guys.
Thanks for the feedback. Made me re-think trusting the opinion of the enthusiast" who advised otherwise (

) and had it checked. Just wanted to post the outcome, in case it helps others.
Mechanic replaced the corroded spring part of the master cylinder (around P250) and the entire slave (~350, much build-up blocking its insides). Labor P500. Flushed the fluid and adjusted the pressure as well.
>errr... how long have you had that clutch, po?
forever ahaha.. I didn't know it would get corroded and my personal routine check would just be limited to checking the fluid level if it needed to be topped up. Now I know. I'm just relieved it's nothing related to the clutch plate and didn't damage a different part.
Salamat muli!!