How DO you adjust the windshield washers on a 1999 Ford Mustang? Read the old posts about this -

Noobz347 said:

Things that I would try before poking anything into anywhere and possibly ruining the nozzles:

Drain the washer fluid reservoir. Mix 1 part white vinegar with 3 parts warm/hot [distilled] water. 2 Gallons should do. Flush the whole system. You may want to make yourself a jumper to run the pump motor continuously. Don't let it run dry.

Disconnect the hose from the nozzles and run compressed air back through the nozzle to remove any debris that might have worked it way in there. Flush the washer tank before reconnecting the nozzles.

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