Rubber grips are somewhat easier on the hands recoil-wise ! I hear wooden grips are more elegant and offer less snag /resistance to drawing from inside pants pockets !
As to the glock , you can safely take a brush to mechanism in the handle [tooth brush] !
< Do you put any light
oil on the pin mechanism that is in the slide?> Yes , no problem !
When you clean the gun , remember to always remove the magazine first , then rack the slide to the rear to clear the chamber of any live rounds -before pulling the trigger [ always in a safe direction and with a backstop] for subsequent takedown ! Most of the accidental discharges with the Glock occur when people forget to clear the chamber of the live round which might be there before pulling the trigger !