Just a quickie. Got my MOT tomorrow, got 2 "nozzles" each side of the bonnet for washing the windscreen. Each "nozzle" has 2 jets. One of the jets on the drivers side is blocked. It still washes the windscreen perfectly with one nozzle.
If the jet are sending water out & onto the screen, it will pass, but why take the chance? as said, prod the holes with a pin but do not put too much force on the jet as you will knock them out of position.