Can you hear the relay / pump operating when you pull/push the lever ?
If you are not getting 12v to the pump then this won't help but does seem to be a common problem .
To check the filters .
Undo the 3 x 10mm nuts that hold the reservoir in place to allow access to the washer pumps.
Unclip the pump from the reservoir by easing the top of the pump away from the reservoir and then the pump will pull out leaving a rubber grommet . Ease the grommet out and it has a gauze filter built into the bottom.
Mine were gunged up and a good wash in hot soapy water restored the washers to their former glory.
Last edited by marlin758; 01-01-2011 at 11:10 PM.