Please use search option, there have been numerous wiper advices given.

- Rainy Season

- question on wipers...

- Windshield Wiper

- Windshield problem

- Skipping Wiper

Yung NWB uses silicon rubbers kaya may skipping. Try to switch blade with cheaper rubber blades then observe. Buffing the windshield will also help even out the rough surfaces caused by wiper blades.