as mentioned it's not the switch;
It's the pump on your firewall.
Unplug the power to your pump on the firewall and it will stop squirting.
If your car is a non-recessed wiper car, the pump is shared between older trucks.
I had this exact issue when I daily drove my car.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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