If the jet is clogged, stick a (thin dress) pin in it, if it does not weep a little when the pump operates it is probably something else. (and you might need a mop as the water is going somewhere else)
I think (from 15 years ago) a cinq has a plug and socket in pipe between car and tailgate, you unplug this, there is then a rubber blank grommet near to the jet which gives access to the rear of the jet and the rubber at rear of the jet can be squeezed to allow it to be pulled out.
But it was my mates wifes car and an early model, and I was merely watching so please be careful, & mine is a Sei.
Noel
[edit looked at my Sei, has plug between tail gate and car, but the blank grommet is way too small and too far away from jet, if you pull out jet dont pull hose out from other end or you will have to rethread..., you need to 'butt join' a new length of rubber hose, to avoid a rethread]