Any advice? My passenger side windscreen washer jet isn't working as well as the drivers side. Contacted my local dealer today as was told that the pressure does be less as further away from pump. Is this correct?
If anything my passenger side "washer jet" is stronger than the drivers side so I'd say yours has likely got a little bit of grit in it.
Try disconnecting the feeder hose and try squirting some compressed air, back down the jet. Sending the air in reverse direction to the normal squirts water flow. You can simply blow down it if your a contortionist.
Whilst you have the feeder hose disconnected, activate the washer system to flush the hoses.
A pressure system, with two equal jets should have the same output from each jet !