is there someway to increase the pressure ?
There isn't a way to increase the pressure on an old worn wiper arm. As far as the removal goes, it likely isn't the original arm, so the method of removal depends on the design. Easiest solution? Find an Auto parts dealer who replaces wiper arms and blades at no charge when you buy them. In my town Advance Auto parts does it free. They are a national chain, and probably do it at most locations.
