Answer:
kings and queens may cling to power and the jesters may have their call. I am the most common but I can rule them all.
I am a million peopleβs wakeup call
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
I am a vegetable that bugs stay away from
You can see me in water, but I never get wet. What am I?
Keep doing me to avoid lens dryness