Any noise originates from a vibration. In the case of a wiper blade, the vibration is often caused by the blade jumping repeatedly on the windshield. The cause generally comes from the rubber of the blade which has taken a bad slant while it was in the parked position at the bottom of the windshield. When there is not enough pressure on the blade this deformation of the blade is maintained instead of flip-flopping as the wiper sweeps back and forth on the windshield. The blade has a tendency to dig against the windshield creating the vibration and noise.
By adding a Sure Wipe pressure spring to the wiper arm, the added pressure will force the blade to sweep in the right position and glide evenly on the windshield without vibration and generate an excellent smooth cleaning.