Under the Bonnet!!!
look at the washer reservoir - it holds a couple of gallons!
you should see 2 or 3 pumps on ther front.
outside one (nearest wing) should be front jets, next to it should be rear jets, if a third is fitted its headlamp washers.
if you need to check or clean the pumps, they snap out forwards and up: and replace with a sharp push down and back.
Be aware that in a cold winter the reservoir takes a whole gallon of windscreen concentrate.
Because of the length of the tubing, washing up liquid foams too much and can go black mould in the tubes (had that when I bought it)
