Today I checked it and guess what? It was covered by dirty grease & compact sands (I live in Saudi Arabia where sandstorms are common).

By turning the steering wheel I could easily identify that the squeezing sound is coming from this universal joint.

The mechanic told me that this universal joint got some play/backlash and therefore spraying with liquid wrench only won't fix it; it should be replaced.

To ensure myself more, I washed it out with hot water jet and suddenly the squeezing sound and tightness just disappeared!

Tomorrow I'll have it replaced and yes; The steering's universal joint is the reason behind my tough steering.

Thanks pals, you're scientists

I'll bring photos tomorrow.