Hey guys, i got the car back from the shop and my windshield wiper fluid isn't squirting out. It comes out the headlamp wipers, but it will not come out of the ones on the hood. Where are the connections? How can I find the problem?

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Own:
2013 C300 4matic
2009 C300 4matic

Owned:
2001 E320 Sport
1992 500E
1989 300SEL