make sure you remove the washer bottle and clean it out as it gathers scum over years ect have a look inside with a torch once off as you cant see it from outside as there's mold ect build up, i used washing up liquid and hot water, with mold you need to leave it overnight.
, i bought a febi pump to replace the one i had as it was leaking when i used the washer i even bought a new seal , and it turned out it wasn't the pump just crap in the water system, once bottle is put back in run water though the system , worse case remove the jets to clear out pipes as i have also had that as i got new front jets and it wasn't them it was scum in the system.. read loads of times about the windscreen washer tabs you put in the bottle as they can block everything up