martin j

Last time recently I had bother with the jets I removed both. Jets, valves short hoses etc back to the single hose from the pump, add malt vinegar to hot water in a mug/glass and steep after agitating them, I would drain the water tank and put some hot water in with a little Milton sterilising fluid in if possible and operate to clean the system, when rebuilding fit one bit at a time from the supply pipe checking the flow as you go, too much screenwash can turn to goo blocking the system especially if not used frequently. HTH.