feeble rear wiper

Hi all!

My rear wiper doesn't clear the water off the screen as it isn't pressing down hard enough, at the edges it does but there's a big gap in the middle where it kind of spreads the water around. I wondered if anyone knew how to tighten or adjust the arm or the blade so that the blade's pressing on the glass harder, so it would scrape the water off the window.

Thanks in advance if anyone can help, Will

Change the wiper blade for a new one :doh:

Daz

already done that mate, didn't solve owt. you can tell by looking at the blade that the rubber at the ends is pressed down against the glass but the middle isn't