most motor on cars are 12 volt…
as for the sprayer thing, check and c if the spray motor works or not, if it does unplug the fluid line, where it goes up to the hood, blow the line c if its claged up, or simply get a airgun and blow from the nozzle it should unclog the line
as for the wiper, is going to be either the switch or the wiper motor…
unplug the wiper motor and c if theres signal coming from the switch