Hi, have recently bought a 2003 Rover 75. When I go to use the winscreen washers it sprays the first 'spray' as normal then as I hold the arm in, the power of the jet fades and ends up trickling out.

If i 'flash' the arm like I would to flash my lights, it sprays out the full jet so I can at least get my windscreen clear but with the grit etc on the road now,my windows need more clearing than usual!
Help

Steve