I have a 2.2 D AWD premium auto Q30 which is only 9mths old. My windscreenwashers have stopped working correctly in that water pressure is very low and sometimes I get no water out the jets at all. I can hear the pump working tho. This problem only started after the low washer level light came on high I refilled the system straight away. I only ever use proper screen wash. The dealer had it yesterday and said they flushed the system and the jets worked for a while( tho not very powerful as they should be) and this morning I got no fluid out at all. Any ideas before I shout at the dealer??