i have a Vauxhall astra 1999 (T)reg my front wiper spray works but back spray dont work but the wiper arm works after having a close looks it seems (i think ) that the pipe to spray is split or has come off because after looking in the boot at rear inside light its wet so looks like its split but would like to know is it easy to fix or do i need to take part of the inside roof off or can it come off from the outside from roof (spray/arial) all in one unit [email][/email]