So I resolved this problem. The radio is water resistant so trying to clean or lubricate the rotary knob, isn't really going to work.
So what I did was, I borrowed a insulin syringe, 0.5 CC and 31 gauge needle from my cousin who's a diabetic.
I Drew up from a bottle cap, a good amount wd40. The needle actually fit in the crevices around the knob and I injected a lot. At least 1 cc. Immediate Improvement but I gave it some time and in two days the problem was solved with some minor issues, I waited another week, I redid the process and I have never had another issue with the rotary knob problem, the oil cured.