Before i start, I did do a search on this and couldn't find an answer. My rear washer will rotate with the wiper arm and hardly any fluid will actually go onto the rear windscreen. I remember reading ages ago that there was a way to fix this and if i didn't the fluid would start to corrode the main motor itself? So can anyone advise if i can just adjust the tightness of the wiper arm to sort this or do i aviod using the washer at all? Thanks.